Serious Body Rust Below Driver's Side

I put a new front rail and crossmember in my 72 Charger in my single car garage without a jig.
Do one rail at a time and it pretty much bolts in the right place due to the K member. After they are in place do the crossmember.
I had a lot of people tell me the same thing. Junk it and find a rust free project.
I felt good saving the one I had.
Good luck!