Good job! How does it feel in your Star Trek?
I ended up shorting across the 1 ohm resistor on mine to get a bit more shake. So now my control board just consists of one diode and one fuse. Played quite a few games with the resistor shorted and have had no problems.
I just loaded the v1.61 game code on my Star Trek yesterday. Wow - what a difference! It is like a whole new game now.
I can give you some tips on putting a shaker in your Congo. Using a flasher output is not the way to go. I would suggest using an ELK-924 relay board. Then you can tie into any signal you want to trigger the shaker.