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I've used similar products in the past as a television set designer. There are rigid foam panels with either a paper facing or a plastic facing available. The plastic is pretty puncture resistant, the paper isn't. The biggest issue with panels like this is the edges, which are pretty easily mangled, so you have to reinforce those. While they're really lightweight, they won't have the durability of the walls that a typical RV has, what's known as a torsion box and isn't much more work than using foam core panels and reinforcing the edges (it's the way Ikea makes shelves). You build a torsion box by constructing a wooden frame and then gluing thin panels (luan) to the face and back. Often RV manufacturers will just glue the luan to the face for economy, although it lessens the structural integrity of the finished panels.
If Kerfkore has heavier duty facings than other foam panel products, it would work for walls although you'd still have to figure out a way to construct corners. There is probably an existing system for doing this but I don't know where you would find it.
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