Harry, I like the idea, but something other than wood should be used to make it. because humidity changes in the wood will alter the hole sizes/shape. I would go with a piece of HDPE or something similar. I made a drill stand for the shafts of my flat spade bits out of pine, and I've had to open the holes up because I could only pull the bits out during the drier parts of the year, and they were just 1/4" blind clearance holes. Holes of specific sizes would be useless in wood as the humidity in the shop changed.
Central North Carolina