I'm thinking about shaving up the ass end of my s10 with a grant customs combo, and was wondering when finishing the body work do you have to bondo the whole thing or just over the seams where it joins to the body? assuming i know what the hell i'm doing too. just curious because i don't really want to have to spread bondo over the whole thing and then do days of sanding, that's what sheetmetaled the bed floor for. also grant makes the best combos, right? thanks for any help.