Here is the information on the Version 1 of the Switch Board Interface
Schematic:
Switch Board Schematic
Board Layout:
Dcc 8 Switch Bottom Copper Final
I used FreePCB as the program to draw the Board layout and then I used the Iron On Laser Toner Method to create the mask to produce the PC Board.
See this reference on how to make Homemade PCBs with Laser Toner.
Finished Product: