You want to line the inner walls first, then wire outlets, and plumb everything, then have it spay insulated and shave the foam level, then put the outer skin on it. Much easier that way.
-blizz
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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