Yeah, I was bored so thought I'd put up a picture of the most recent big wheel I've made. I always thought I was better at this stuff than drawing anyway, though that's not saying much in either case.
It's made from a 20" bicycle, a patio chair we found in the trash, misc. steel pieces, and some elevator guide wheels for the rear two wheels (yes like the elevator you ride up and down in). I built it so it can also have some little, all steel floor jack wheels put on the rear as well. It's great for fish tailing on smooth concrete that way, and boy do they make a lot of noise.