That jig looks like a solution of problem that doesn't exist:
The problem: The arch of the guitar top, and especially the back, will change the router alignment. Without the TrueChannel, a standard router base will tilt, causing the routed channel to be too deep or too shallow; the bindings won't fit right. TrueChannel keeps the router vertical for a square ledge. Bindings fit correctly.
I think I'm quite good at geometry and just don't get it... First the arch of guitar back (think D-28) is not so severe to cause any real problems, you follow the SIDES of the guitar anyway. And you would have to be really poor at holding the body during routing to cut bad channels on ordinary router table.
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