Yep, wish the floor pans would be made to extend all the way back to the cab corners instead of splicing in the "rear outer section" along the door sill. Whole floor pan like the one pictured above would require some major bracing to keep the cab from tweaking. Only well equipped and experienced shops would be able to install them without a big hassle.
Come to think of it, wouldn't you have to remove the outriggers to install a full pan? 
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'72 GMC SWB C1500 Custom, frame-off in progress. 383 SBC, 9:1CR, Comp Cams XE262H, Scat internal balanced crank, Eagle SIR 6" rods, Keith Black dish pistons, Dart Iron Eagle 72/180 heads, Weiand Stealth intake, Stewart stage I water pump, Holley 4bbl vac sec, TH350 with B&M Shift Improver Kit. 12 bolt positraction.   
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