I had to modify a reciprocal saw blade to fit in a jig saw to cut through the 2" foam and fiber glass. I use that for the curves. The straight cuts are done with a circular saw. The fiber glass is hard to cut with either of these saws. I use the best saws I can so that I get a nice 90 degree angle and a nice surface for the cap. Some block sanding and filling is still required.

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