BRUK, Awesome work! I designed these boards(and the RCMC), so if you have questions I may be able to remember the connections and answer them if not proprietary in nature, although I don't have access to the design files any longer. Just email me. BTW: The "CR" pin on the BEMC switches is VPP (your label is PRG on the RCDR), and used in programming the board(s).
jon