Breadboard with 4 mm safety banana plugs

I could not find any breadboards with safety plugs on the market - only the ones with old fashioned non-safety 4 mm banana plugs and often connectors of a poor quality. So I designed my own instead.

This item was made on a laser cutter with 4 mm plywood. The layers were stacked together and glued with normal wood glue between each layer. The holes for the small cables going from the plugs to the breadboard were drilled with a 3 mm drill.

It is designed for two 830 tie point breadboards wit