Floor pans. gulp...help...

Yea my interior is completely gutted..and I have all the tools just picked up a lincoln 140 welder with a tank of gas.whoever had the car last tried to rivet sheetmetal into the floors then they bolted the front frame rails in...yes with nuts and bolts...it was a completel hackjob. I believe the torsion mount area is ok but I have rot on the drivers side frame rail so I have to replace that as well along with the floors.I alsoam going to have to fab some pieces into the top of the fotwell area and a little below the back seat