I too learned about the mysterious inner workings of the automobile through building models in the '60s. I also learned about world history by building WWI and WWII airplanes. Boy did i go through a lot of tube glue!
Those are some great builds. I really like the DJ car, haven't seen that one before. And my all time favorite driver, Handsome Harry. Thanks for sharing.
More progress......
http://www.computerworld.com/article/2925090/3d-printing/monsters-mustangs-and-motorcycles-the-coolest-3d-things-at-rapid.html?phint=newt%3Dcomputerworld_dailynews&phint=idg_eid%3D8074ceeb7b0b052bab54f4d1e59068da#slide1