Tips on fixing this floor pan, driveshaft damage

Picked up a Cutlass from out in California and the floor pans are ballooned up in the rear. Drive shaft must have come out of it and beat the floor up. Id like to save the pan because its rust free, just beat all to shit in the back. Whats the best way to get it back into shape?

 

What year cutlass? I would probably recomend cutting out and replacing, or a big hammer, get all the supports straight than work the sheet metal from there. To do that you would need to drill out the spot welds and reweld them. Drive shaft damage is difficult.

 

Its a 65

 

http://c2cfabrication.com/store/product_info.php?cPath=3_45_127&products_id=4859
http://c2cfabrication.com/store/product_info.php?cPath=3_45_127&products_id=5179
http://c2cfabrication.com/store/product_info.php?cPath=3_45_127&products_id=5279

Pans are easy to find, and decently priced. just need to find all the effected area