Hi Mischa,
Sorry for the delay, life has been a bit busy.
I've changed the set up now, sliced off the top schematic so I can move it up the drawing board, taped down the plumb line (I thought it sensible to use the vertical supplied) and drawn a corresponding vertical on my paper. I've checked that the board is level with a spirit level.
The plan is to give this about two hours per night, so it may take a little while. I'll give it more if I can find the time. Here's a pic of the current set up, hope you approve:
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