I have uploaded initial photos and instructions but I can enhance these more if there is interest. 3D stl files and OpenScad model is now uploaded for printing and customisation
I will probably create a separate project for the AtTiny85 continuity tests. It is a very simple project but is also a good introduction to the AtTiny85 DigiSpark (and clone) boards.
Most of the wiring connections are now shown in included images. I will also add images next for the PSU, switch, fuse and XT60 connector