Ive got a 36 chev striped to the frame. I am going to remove all the stock crossmembers,except the one at the front as i already have a mustang II front end installed, and box the frame. How think should the metal I box it be? 10gauge? Any tricks on how to make the frame stay straight while I remove the crossmembers and box the frame? I was just going to weld a couple tubes to rear of the frame on the top and bottom of the frame.

Where should I make the new crossmembers? Out of what? anyone have any pics?