I originally designed this organ to be based on a bar main chest with a conventional relay at the back to direct keyframe signals to rows of push-rods operating pallets, just like larger organs. However, the prototype demonstrated that excessive wind usage would leave the organ breathless.
The distribution board idea is for the organ to incorporate the relay into the chest itself, resulting in an extended relay directly feeding wind to the pipes. The channels can be routed individually just where they are wanted.
I needed two layers of these routed channels, so the layers of pine were separated by a layer of thin ply, with the whole thing sandwiched between two more layers of ply. Not now a "chest", it became a distribution board as it directly distributed the pipe wind from the keyframe relay to the pipes.
The top picture here shows one of the ply layers being jig-sawn after the initial positioning holes were drilled.
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