While Harley Quinn was originally created as a sidekick for The Joker on Batman: The
Animated Series, three later episodes resulted in the classic team-up of Harley and Ivy.
Poison Ivy had a pink convertible with "Rosebud" for the license plate number, but being as
there's not a huge variety of car parts in pink, I decided to go with a red body instead.
It turns out that this exact design can only be built in red, yellow, black, and white due
to the style of fenders I used, and since there's a 12-year gap between when the doors were
last made in white and the fender was first released, it might be very
difficult to collect all the necessary parts without having to use a mix of new and yellowed
parts.

This was an odd build because I was convinced that I had a final design nailed down about
five different times, only to come up with just one more cool feature I could squeeze in.
Currently, there's a working rumble seat in the back (you have to pull the side of the car
off to open it, but it closes cleanly), a non-working gas cap, a single side-view mirror
(passenger side-view mirrors being a much more recent thing), visible bumper mounts for the
front bumper, a non-working drive-train (including transmission, driveshaft, and rear
differential), a fully detailed interior, a tailpipe, and a unique license plate.  Many of
the Exo-Force sets come with a 1x2 tile that has an 8-character code printed on it, and it
appears that at least some of those sets have codes that are not repeated from one copy of
the set to the next, which is perfect for putting generic license plates on cars.