The router is changed to the hex set-up:
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What isn’t visible in the photo, is a fat, precision hex-shaped piece of aluminium. It can rotate around a 5 mm pin and carries two vicious, little spikes that stick into the work piece and prevents it from rotating. The set-up can be locked at each 60°.
The desired hex shape is drawn on the wood (4 mm aircraft plywood), and a 5 mm hole is drilled in the center. The ply is adjusted so the table’s movement is parallel to a side. And as with the sides: easy does it, little by little, until it fits the end box frames, then glue:
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