I have just made another revision to this project after learning more from the last. I hope to have new PCBs next week (they are being made now) There will be another set of STL files for the 3D mounts internally also - so check here, and GitHub, before making any more PCBs. Nothing wrong with previous ones of course but I took opportunity to make the PCB smaller as the extra material was not necessary for mounting holes as I first thought.