I've designed my own take on a 2x2 supplemental spoil board.
I needed more holes than in the Myers wasteboard and wanted to have a simple 4 piece design.
Here is an interlaced 2x2 pattern with 4 quadrant design. It uses threaded screw-in inserts.
You'll need to cut this 4 times for a complete spoil board for the XXL.
I'm using these inserts: https://www.amazon.com/gp/product/B002KT43MU/
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For a full size XXL, you'll need to make this 4 times.
There are 5 mounting grooves allowing you to secure the spoil board to the bed of your machine.
There are 3 carving groups within the design file...