Final revision, PCB was made slightly shorter so those 15 pin male connector would stick out for easier mounting into PCB boxes.  Added missing pullup resistors to button C and D line, this could have caused intermittency rapid firing without pressing any button if the rapid fire circuit was assembled.  If you got the older version of the board without the pullup resistor, solder one side of each resistor to pin 2 and one to pin 12, and connect the other side of resistors to VCC source like pin 14 or the nearby capacitor.

To do: SMD version for smaller board size maybe?