I have the same respect for my router as I do for alligators, and other powerful things that bite. I use a jig with everything, and try to get some practice before using it with anything I care about. This is a jig I built for routing a battery box on the back of my G&L:
It's one of the more successful jigs I have made. My router has a circular base, so the guide is actually the outside edges of the jig. It is easy to line up, since it makes a hole exactly the size and shape the one in the middle of the jig. It's about as idiot proof a way of making a rectangular hole of anything I have found. It works great on flat surfaces... Since the holes you need are rectangular, I think you could use something like this.
You would need to use shims and about a million pieces of low tack tape. You'd need to get it totally immobilized. I'd probably be inclined to build it in such a way that in addition to the shims and tape, I could drive a few screws--maybe a couple in the holes where the tailpiece goes and another in the neck pocket.
The trickiest bit will be securing things so that the jig and guitar body are totally immobile without marring the finish. Of course this is just an idea. I know it works well on flat surfaces as I have done it a bunch of times... Of course, the sexier the curves the more problems one encounters. (I wonder what else I could apply *that* lesson to...).
Will be curious if you or someone else comes up with a better idea. This is just the best that occurs to me at the moment ;-)







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