Allows using 1/4" MDF instead of 1/2" ply and 2x4 + shim to set up the Shaper Systainer jig once it has been cut. Works on any MFT-style table top with 20mm holes on 96mm centers. Pictured using a Bora Centipede. Print at least 4 of them for a stable top once the foam is inserted. Gluing to board after putting in table optional, but not required. I never did and nothing went wrong (even if the whole jig moves, it's all relative to itself, so cutting works fine.
The author hasn't provided the model origin yet.