Explanation of the instructions of Domtoren Utrecht
About the designer
The designer of model ‘Domtoren Utrecht’ uses the name ‘bolbuyk’ and lives in Utrecht, the Netherlands. You are free to use the instructions, however, when you display the built model in public, for example on exhibitions or in public areas, and/or when you distribute these instructions and/or display other instructions meant to build the same model, I expect you to clearly mention the name of the designer: Bolbuyk from Utrecht, the Netherlands and mention instructions and part list are available at website www.rebrickable.com, search for Domtoren.

About the Domtoren
The Domtoren in Utrecht the Netherlands is the tallest church tower of the Netherlands (height is 112 meters).
Its design started as part of a new church during the 13th century. The Domtoren was projected to stay independent of the church, separated by a passage of about a meter. The Domtoren itself should consist of three clearly distinguishable sections, which, according to some, is a symbol of the Divine Trinity. The lowest section should be square and massive, the middle section square but more open, housing the bells and the upper section (the lantern) octagonal with an open top, making the total projected height 126 meters.
The building of it started in the year 1321 as part of the building of the new church. The building of the choir had already started at the end of the 13th century. They started with the foundation, which can be reached from a door on the north side of the tower. The entrance to the tower was built at a height of 7 meters where it connected to an already existing gallery. From 1321 to 1328 the first 27 meters were built (to just above the highest row of niches of the lowest section). Then the build stopped for over 15 years.
Around 1344 building continued and in 1360 the low and middle sections were finished. The base of the lantern had started. Four of the eight walls on the foot of the lantern had been built when serious constructive issues appeared. The projected tower was considered to be too demanding for the structure of the middle section, especially for the connections above the arches at the east and north side. After a decade the design was reconsidered. The open top was replaced by a closed roof, reducing the projected height from 126 to 109 meter. In 1370 the build was resumed and the Domtoren was finished in 1382.
At that time the church was far from finished. Eventually the church was completed at the beginning of the 16th century when the nave was finished.
In the summer of 1674 Utrecht was tempted by a tornado which destroyed the nave. The Domtoren and the east part of the church remained intact. The remnants of the nave remained about one and a half century and became a gay meeting place. When the remnants were tidied up the Domtoren stood clearly on its own.
At some time the roof of the Domtoren was replaced by another, slightly steeper, one, raising the height a few meters to its current 112 meters. Interestingly, this is the same height as the well known Saturn V rocket which brought men to the moon.
Today the Domtoren can be visited and be climbed. Yet the tower is entered by a quite ordinary entrance building on the south of the tower. On the upper floor is the connection to the entrance of the tower at the height of 7 meter.

About the model
The objective of the model is to represent a model of the Domtoren at scale H0 (1:87½). However, for several reasons, I had to make deviations from the  real Domtoren.
Considerations I let play a role are:
-	The Domtoren should be clearly recognizable in the first place and not primarily a ‘small version’ of the real tower.
-	I exaggerated some features sometimes at the cost of the mutual relationships of other parts of the tower. An example of this is the passage under where I used offsetting to suggest the ‘inviting’ appearance of the gate.
-	At some points I introduced some fantasy, partly because some features were really hard to build and partly to avoid monotonous appearance in some places.
-	I tried to limit the amount of parts and, more, to limit the amount of different parts/colors.
-	I tried to avoid really rare/expensive parts and to look for a low price for bulk parts (especially for the tan bricks, where 1x2x2 and 1x6x1 appeared to be the cheapest in studs-x-bricks).
-	The model had to be solid and steady.
Some details and features I’d like to draw your attention to:
-	At the south side is a garden
-	The roof of the passage has a cross-construction, using SNARL based on 345-triangle
-	The colors of the lower third of the lower section (dark bley – dark tan – tan) have to suggest solidity
-	The niches of the lower section are decorated by masonry-profiled bricks to suggest depth. These bricks were placed with the help of a randomness generator
-	On the north is the entrance to the foundation, on the south the entrance to the tower
-	The stairtower is recognizable at the south side
-	On the east side is an arch which is not at the west side
-	At the base of the middle and of the upper section small towers are placed at the corners and in two more at each side
-	The niches of the middle section and the large niches on the east and west of the low section were mainly built by using SNOT
-	The planks in the lower half of the middle section are represented by black tiles which can be arranged in a way it looks a little ‘messy’
-	The middle section contains a small tower-like structure inside
-	If the hour pointer of one of the four clocks is turned, the other hour pointers move in the same way
-	The walls on the foot of the lanterns use two different designs, representing the difference in design between those built in 1360 and those built in 1370
-	The roof mainly consists of closely adjoining 3x12 wedge plates which results in an octagonal pyramid with a base angle of 66.3 degrees (actual angle of the real tower is 65 degrees)
-	The top has a kind of dragon which I choose to refer to the tornado of 1674
-	Inside the build I made also use of technic beams, DUPLO and minifig baseplates
About the sachets
The full part list is available at www.rebrickable.com. To create overview I distributed the parts among 52 virtual sachets organized in 4 groups. Groups A, B and C each contain 17 sachets numbered 1 to 17, group F contains just one sachet, numbered 18.
The sachets are organized in such a way you can easy build the Domtoren by three builders together. The least experienced does the sachets A, the more experienced the sachets B and the most experienced the sachets C (which is the main build). When the builders keep building their sachets with the same numbers at a time, subbuilds made by A and B are ready at the right time to be used by C. The final sachet (F18) has to be done by one builder. When you build this on your own you can either build all sachets 1, then all sachets 2 and so on. It is also possible to first build all sachets A in numerical order, then B and so on. For building by 2 builders there are different possibilities, for example, the least experienced starts with sachets A and then does B10-17, the most experienced starts with B01-09 and then does sachets C. An overview of the dependencies of the sachets is given at the end of this document.
For each sachet the parts are photographed, but I found some errors. Those are summed up at the end of this document.

About parts and colors
A total of about 11680 parts are needed for this build. There are 438 unique parts/colors (according to www.rebrickable.com). There are 16 colors, of which 6 are entirely invisible (namely red, white, blue, yellow, lime and bright green). An amount of parts is just barely visible and in most cases these are black, light bley or dark bley. In general, one of these colors is used, but you can use another color of these three without really affecting the appearance of the final model. You have to find out for yourself. All printed parts are also invisible.
From a lot of parts different molds are known. In the most cases it doesn’t matter (as far as I can conclude). But the exceptions are:
-	Archbrick 1x5x4: 14 of them are used and 8 tan ones are applied in sachet B07. For those it matters that the archbrick should have a reinforced underside because a round 2x2 baseplate is attached under it
-	Cone 2x2x2: 23 light bley are used and one dark bley. They all should have a completely open stud because a bar is applied through the hole in the stud
-	Jumper plate 2->1: Today there are (as far as I know) three molds. One has straight sides and two have a groove. For light bley and dark tan I used molds with a groove and for the other colors (dark bley, tan, dark red and white, but the last is not visible) I used straight sides. It is not for functional reasons, only esthetical.
About the photos
The photos were shot in different sessions, so sometimes there are parts which suddenly appear in another color or a slightly different appearance. This is because I applied small modifications during and between the photo sessions. However, I am pretty sure the photos are clear enough and unambiguous to build the model. The parts and/or subbuilds displayed on the photos (generally in front of the build) have to be applied in the next step.
Sometimes I use an icon and/or an arrow. The arrow has a magenta outlining and the centre of the arrow has the color of the part applied in this build step where it points to. This is generally used for barely visible parts. The icon on the right upper corner of the photo with a stylized image of the domtoren and two arrows in red on a sand blue background means the same build step has to be done on both sides of the build (front and aft of the build as displayed). The icon with the octagon in the squares and the four arrows means the build step has to be done on the four sides (or four corners) of the build.
ATTENTION: It is not indicated when the (sub)build should be turned. Most times when the build has to be turned the sigfig appears in the last step before the build has to be turned but that is not always the case. You should pay attention to the stairtower, which is the most recognizable part of the tower to determine its orientation.

Finally, I wish you a nice build!

Dependencies of sachets to build
C02 depends on A01+B01+C01
C03 depends on A02+B02+C02
A04 depends on A03
C04 depends on A03+B03+C03
C05 depends on A04+B04+C04
C06 depends on B05+C05
C07 depends on A05+B06+C06
C08 depends on C07
B09 depends on A02
C09 depends on A06+A08+C08
A10 depends on A09
C10 depends on B07+C09
C11 depends on C10
C12 depends on A11+C11
A13 depends on A12
B13 depends on A08+B10+B11+B12
C13 depends on A10+C12
A14 depends on A11+A13
B14 depends on A11+B11+B12
C14 depends on A07+B09+C13
A15 depends on A11
C15 depends on B08+A14+C14
A16 depends on A15
B16 depends on B14+A15+B15
C16 depends on A15+C15
B17 depends on B13+A15
C17 depends on B13+A16+B16+C16
F18 depends on A17+B17+C17

Errata on photos of parts
C02: White plate 2x6 should be 3x instead of 2x
B06: Dark bley brick with pin 2x2 should be 2x instead of 4x
C06: There should be white round plate 1x1 4x
C06: Tan brick 1x1 should be 11x instead of 10x
C09: Tan brick 1x2 should be 22x instead of 21x
C11: There should be tan brick 1x6 5x
C12: Tan brick 1x6 should be 1x instead of 6x
A15: Tan corner brick 2x2 should be tan corner plate 2x2
C15: Light bley sloped tiles 30degrees 1x1 should be 4x instead of 8x
C15: Light bley corner plate 2x2 should be 1x instead of 3x
C16: There should be light bley corner plate 2x2 2x
C16: Inverted slope 45degrees 1x2 4x should be dark bley instead of light bley
C16: There should be a light bley plate 1x2
B17: Dark bley plate 1x1 should be 3x instead of 2x