The idea actually comes from the boating world. Generally boats have a composite core in their hulls and decking consisting of balsa wood or foam coring sandwiched between an outer and inner layer of fiberglass. This is done for strength and to keep the boat light.
Where they have thru-hull fittings (deck cleats, or whatever), they either don't put coring in that area but put a plywood backing in place of the coring, or they make an epoxy tube like I showed through the balsa or foam coring.
I simply use Microsoft Paintbrush for the drawings, if you can believe that.
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The only thing that works on a RV is the owner...
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