You can build a guitar with just a jigsaw. It will do everything you need to do, it just won't do it as well as a scroll saw or bandsaw. The biggest problem with a jigsaw is that the blade is only fixed at one end. It stays fairly perpendicular when cutting straight, but will get pretty crooked cutting curves, especially in thick materials. If you are going to use a jigsaw, cut well outside your lines and sand-in.
Water-based "polyurethane" is not alcohol-proof, even when fully cured. In other words, it is not a suitable finish for furniture, floors, counters, bars, or basically anything. And that's any kind of alcohol, including drinking alcohol. As far as I am concerned, that is no kind of finish at all - as bad as lacquer. I'll go forward with this debacle because that seems to be the easiest thing, but now I have an alternative if need be - I know what I can strip it off with.
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