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.
The subject of capacitors in guitars is rife with fraud and nonsense. The fact is, the capacitor is not IN the signal path, it is very much OUT of it, and only has any effect when you select it, which is probably pretty seldom. The capacitor is part of a low-pass ( or rarely high-pass ) filter, basically a frequency-dependent leak to ground. It is not making 'tone', it is taking it away. The type of capacitor that you use for this really doesn't matter at all, as long as you don't use a polarized one the wrong way. Orange Drop, oil-in-paper, film, ceramic -- makes no difference. Anyone who claims it does either has a very vivid imagination or is trying to sell you something.
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