Lower Wheelhouse Replacement Part, Is it meant to be single layer, or double? Options

[Gudhjem]

I’m working on repairing the area below the Hell Hole – basically the bottom of the passenger long around and behind the jack post.

My plan is to preserve the double-wall original aspect, so I’ve been taking pains weld new metal onto the inner C-shaped long pieces before I repair the outer pieces that sit over them. TIG welding on slightly pitted 20ga is challenging, but I’m managing. I’d rather not go the single-wall replacement route that the RD/AA inner long piece for the engine compartment is designed to do (the one with the corrugated ribbing that shows after install).

As part of this, I need to replace the metal around the jackpost on the inner wall. I’d like to be able to use this piece from RD:



Can anyone tell me if the RD piece is meant to go inside of the outer long (like the original configuration) or if this is meant to be a single-layer piece, with nothing over it? I'm guessing it's meant to be single, since I think I see a flange on it, and the inner "C" channel pieces don't have that. I’ll have to do some pretty tough fabricating to get the jack post hole right...

[peteyd]