Hello i am new so please go easy.
I have been working on my jimmy and got most of it done. then i noticed the cargo area started to sag bad. i looked under and put my hand on top of the gas tank to find my floor in the rear is rotted badly :s what do you think would be the best way to go about with the floor repair. thanks alot in advance.

 

hell id toss some fiberglass on it and put some carpet back over... all though may i say iv never customized or fixed anything in my life.

 

http://www.LMCtruck.com has floor and bed replacement panels you can use.

The fun part will be cutting out the old and welding in the new. I personally suggest dropping the tank before doing this but there are ways around anything. Also if you prefer not to weld you could rivet in the new panel and seam seal the crap out of it. It will last for a while.