Made a template of the old versus new profile. The lines represent the existing crossmember and the upper edge, the new floor profile. View attachment 1715551835
Great idea on the template! You could always get a piece of 1/4" flat bar that is the same width as the existing torsion bar crossmember bent to the same shape as your new floor pan. Leave the lower ends long, and then cut the torsion bar crossmember out and weld the flat bar in. You could then spot weld the new floor pan to the bar, and it all would be as strong or stronger than what is there now. That would give you room down the road to install an A500 or A518 OD transmission if you ever so desire.
