Well I cheated. Instead of making a new mainboard tray to hold the SKR PRO I just made a small adapter to mount the external MOSFET I wanted to use for the new 50 watt heater on the Mosquito. I will still do all these things but I am really anxious to get to printing with that BMG-M and Mosquito. This printer is wild. And even with all this I have managed to keep my electrical tame. A task anyone can handle if they just put a little effort into trying..