Can someone post (or link) the source code files if you've done this already? If not - Should the mainboard be redefined as RBV(R2) single extruder motherboard instead of RBV(C2) with the necessary size changes? How best to make this swap in boards.h? Any other changes? I've assembled the rest of this project and now looking at the configuration.h, pins_ROBOMB.h, and boards.h files from GitHub as well as the OctoPrint settings/gcode updates and LCD control panel changes and found many places in the Marlin files where changes are or may be needed. I'm not sure I've identified or if I fully understand all the implications of making these changes as this is my first foray into Robo/Marlin territory with everything to learn including revisiting my C++ skills. The "Connecting a heated bed" thread and others answered a lot of the hardware/build questions - thanks to all contributors! Care to post the results? This may include the files I need. I may tackle the internal MOSFET to external MOSFET interface issue once I get the basic mainboard configured, loaded and heating the bed using the onboard MOSFET with external 24Vdc 15A PS.