Just an update for anyone who is interested....
I did a quick mock-up of the new lower rails and crossmembers this past weekend to see what the fit-up looks like.

A couple more... The notches came out great and I have some really nice tight fitting joints for Tig welding.

I still have to clean up all of the welding surfaces yet, this is just a look see for fit-up. I will go over all of the joints with a flap wheel on the die grinder to prep for welding...
Thanks for looking.
Mark