Stop in for a cup of coffee

Pieces of sheet metal. I still had solid metal in the corners, Nothing sagging or breaking apart.but sides of the box were thin/holes in a few spots. So where possible I plated the inside then layed another piece into area I cut out. This was just small stuff. If it was much worse or a higher performance build I probably would have looked for doner rails.
ahh I think I'm in the same boat, but I am going higher performance, I'm just gonna cap them from the outside, por15 the hell out of them, but I thought about getting some thin wall box tubing that fits between the rails and welding that in, sure it'll add weight.