Hi Lachlan, Barry,
Attached are images of the Busch Pressman Lens board. These pictures are from the LF forum. I'll try and post images of my camera soon.
Notice the little notch to the top of the board? That design seems to be specific to the Busch Pressman. The hole in the front of the board seems to be something that the lens board designer made himself, I don't have that on my camera.
Also, there is a 3D rendering of the lensboard at this site: https://www.tinkercad.com/things/7YAvnYx0Lzw-busch-pressman-4x5-lensboard-prototype
(although i fear the 3D rendering might not be for a copal no 1 lens).
I'll look up the LF forum. But I may just prepare myself for that long drive.