The frame rails will be 2 x 4 rectangle tubing. I don't know what kind of car it is... I'm building it all... haha. It'll be similar to a T-bucket only longer. I don't have a frame jig, but I have a 4' x 16' table I can lay it out on. I have a cnc router that I can use to route wooden jigs to get stuff in the right position. I guess I could go to a jag junk yard and take some measurements.