I have been working on this go kart forever. Yes forever. I made the frame from 1"x1" square tubing. I didn't have a pipe bender so when I designed the frame in college I used all straight pieces of tube. I'm getting closer to having it done but there is still a long way to go. I'm also going to redo the rear set up since the current design isn't strong or stable enough. I'll finish it someday.