Keep in mind it will need to be primed or sanded right after sandblasting to keep from flash rusting. I'd try to acess all the damage and cost to fix the truck before spending any money.

Eric
http://s1199.photobucket.com/user/sparky234/library/My%2057%20Chevy%20Stepside?sort=3&page=1
'57 Chevy 3100 (Little Red)
'81 RD350 LC - Fun, Fun, Fun
'83 GS1100E - Pocket Rocket