1965 Valiant Firewall questions?

I bought a passenger floor panel for ~$55 thru rockauto. Shipping wasn't too bad, maybe $20. They have driver's too (didn't need). It didn't have all the right curves, but a rubber mallet fixed that. I butt-welded, but if I did again I would probably lap 1/8". Take the opporturnity to wire-brush and paint the inside of your cross-member and frame rails as best you can. I cleaned, then dragged a rag w/ Rust Destroyer thru the frame rails.