Lego: DeLorean
So my latest build is Lego's Back to the Future DeLorean. You first build it as the 80's version, then you can convert it tot he 2015 version by deconstructing it a little and using the remaining parts, I'm leaving it as the 80's version for now (as it stores back in the box assembled and I just don't have the space for it sitting out right now... I bought 440 POUNDS of Lego bricks so space is limited right now, I'll post about those once they all arrive).
Also, remember when Doc pours the beer into the Mr. Fusion, well a few years ago I did some math to figure out how many jigawatts were in that beer after reading that electric DeLoreans were going to be made from largely original parts go check the post out if you haven't!