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Only issues I see with the initial chassis build are as follows;
When you stripped the chassis, you forgot some rubber grommets, the horns, some misc hoses and wiring, and seems the windsheild wiper mechinism. The grommets will be the 1st area this duplichipper bedliner will flake off.
Also, if your car see's sub 30*f weather, I wouldnt advise "just" spraying the bedlinner on the bottom of the car. Reason being the stuff pretty much sucks ass. You need an epoxy paint over etched clean primer. When the bedliner flakes/lifts up it forces the salt right between the chassis and paint, forcing intercourse with the metal. You will never know the rust is spreading like aids underneath.
Undercoating is a very touchy thing, really the only way to do it, is to completely strip the underbody of paint, etch it, epoxy paint, and a durrable top coat. Rubberized undercoating will stick to the paint, however lift all layers of paint "up" when it cracks from the heating/cooling cycles of mother nature. So just use epoxy paint.
On our cars the most rust happens where the factory undercoating is.
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