Its been a while but ive pulled together the PCB drawings - I have put together a 3018CNC which I am planing to use to cut the PCB with - the big catch will be the clearance between the pads for the RN52 (Bluetooth module)  The rest is pretty good with greater than 0.3mm clearance which I am lead to believe is sufficient.

Setting up Flat CAM was a bit of challenge with all the Python dependencies but it appears to be running. Now Ive got the PCB designed I can give the rest of the tool chain a run and see how it works out. If the engraving the PCB doesn't work out I can etch it but that's messy and needs pre-sensitized boards.