The board is fully populated  and testing with half the relay boards  is 100% perfect - A pleasant surprise. I've build the 5V regulator circuit board, thats the proto board pictured center frame, cleaned up the wiring from the remote board, its the board in the left of the image with the yellow tape. The arduino programmed without issue through its programming pin header.

The next steps:

1.  Finish testing with all relay boards
2. Plan the chassis
3. Make electric matches