This is Marks rim trimming set up. Note the X and Y axis arched guides used to establish a dish with his router. Like on his top/side junction where he uses a 47 radius on the rims with a 30 dish radius on the top; he uses larger 18 radius on his rims than what he dishes his back to (12 radius). My Bristlecone is getting a 1 Manzer wedge for enhanced playing comfort; so the low E string side of the lower bout is only 3-1/2 deep and the high E string side is 4-1/2 deep. He marks target depths on the rims for the wedge and elevates the guitar from beneath on his work-board to establish the angle relative to the router to create the wedge.
