Features:
All functions controlled remotely
3 Part boom of around 90 studs length when extended
180 Degree steering range (+-90 each way)
~21 studs wide
~55 studs long (chassis)


Main components:
2x Large PF Motors
3x Medium PF Motors
3x PF Recivers
1x PF Battery pack
2x Turntables
3x Worm gearboxes
2x Simulated boom luffing cylinders

Custom componets:
1x PF extension wire (prototype design using telphone cord)
2x 3L Friction pegs cut to 2L (so that stop is on the edge)
boom lift string is linen sewing thread.  It is really really strong when just off the reel,
but time weakens it quickly.

Time taken for build:
Approx 4 months

Things I would do differently next time I make one of these:
- Reduce boom to 2 part as it currently is out of scale
- Improve steering by gearing down and make it less likely to slip

Things learnt:
- Half thick 12 tooth bevel gears will break easily :)
   They were in the steering first design, the large PF motor broke it easily!
- Cramped building is hard!
- Studless lego is really hard to get chassis rigidity
- using scaled up pdf blueprints makes basic design prototypes a lot simpler and quicker
- simple can be best; the boom lifts use string! (how quaint)