47-55.1 Chassis table

[mick53]

I need to make a chassis table to do the boxing and X bracing on my 53 3100. I hate buying steel for temporary jigs. I throw tons of steel away when I build my dry ice manufacturing plants but I'm always many states from home. My customer that is about 80 miles away told me that he has 20' sticks of new 3" or 4" angle that I can have. Will this work? Should I weld 2 together to make a square? Also do I want to mount to the frame rails or the leaf spring mounts? Thank you for your time.