Floor pan plan of attack

[mplex2000]

I was a little surprised to find any rust under here but it was indeed there.

It's not the worst I've seen and after the work I've already done and the rest I still need to do, I'm trying to get out of this as easy as possible but do want to do it right.

I'm not much of a mig guy but I have one and I used one of these copper block things when filling holes in the firewall last week. It worked well but it's only about an inch square. Wondering if I should use it to plug those holes or bite the bullet and cut out all the rust? I'm not all that great with sheet metal and always end up blowing holes everywhere - the copper block helps me with that but welding in large sheet metal patches will be a bit of a chore.

What's your thoughts?