Went with the knife followed by a black Sharpie
I've got three of the 4 sides cut.
Hopefully I'll have 3 hulls by the end of the weekend. As oppose to one hull, and a bunch of glued lumber :)
BTW the fiberglass butts are only glassed on one side. I used the "scrap" as test pieces, and I think I might want to put at least one piece of glass on the outside before I torture the hulls. I was going to wait until sheathing the hulls to cover the glass the exterior of the joints, but I'm having doubts they will hold up to the "torture" :)
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