I have made vehicles for 3 3/4 inch figures, and my latest is my custom terrordrome made from foamboard and posterboard. I also have made a captain power skybike as well as a cobra flightpod. Oh, and twenty years back, I built, out of posterboard, three vehicles, scaled for my joe figs, and the three vehicles combined to form a robot-like vehicle(My inspiration at that time was the transformers cartoon: the ones that combined to form a larger robot.) I have also made full sized halloween costumes from posterboard as well.