Hi
When I posted I thought what I wrote made sense, re reading it, it dosent, sorry for the confusion. The ally extrusions would have the correct shape already, no folding at all. I was going to get my sheet metal guy to fold me up something to do the job in thin gauge steel.
The PO of my car filled in the running board mounting area to make the body stiffer, see photo, thats why I need custom running boards.
Steve