Subframe connectors and stiffeningkit dxf_files ????

It's a PIA to tie connectors to the floor contours. I don't do it. I like the 2x2 because it doesn't intrude or push hard against the floor pan. The way BBD has it, they are jacked up against the pan in some spots using 2x3 and running them up tight.

Agreed, much easier ways to get the structure/support/strength that you may want