I think a decent mig welder is a must and if you don't know how to weld get a lot of practice with it.
Penetrol is your friend, I gave nearly all the bulkhead a coat of penetrol and anti rust primer.
I was quite lucky rust wise, it was all just surface rust, but I did have a fair amount of cracking on welds and in the floor. I have still got the orig. foot well panels, a little lumpy but it just adds character.

