Brook Universal Fighting Board into a Hori SCV stick. Help appreciated.

I recently picked up the version of the Brook Universal Fighting Board with all soldered headers (thanks, Paradise Arcade Shop). While I’m decent with wire strippers and a crimp tool, my soldering skills are surely not up to snuff. I’d like to avoid soldering if at all possible..

Here are the button functions that I’d really like to retain that are part of the sub pcb on the top button panel:
- PS
- Select
- L3
- R3

The following are nice-to-haves but really are not a priority:
- Port LEDs (1-4)

The rest I don’t care about at all (don’t use ‘em)
- Turbo
- Turbo LED
- Toggle switches

I’ve done my best to trace what’s what on the sub and main pcbs. Take a look and let me know if my guesses are correct.

Sub PCB


Main PCB


Now I see only one ground wire and one VCC wire on the sub pcb (well..at least feeding the right ribbon cable).



But the Brook Universal Fighting Board manual states that I’ll need the following:
1. Dedicated Ground for Start/Select/PS
2. Dedicated Ground L3/R3
3. Dedicated VCC for Port LEDs



I could most likely daisy chain a ground wire feeding from the Start button (off in the corner of the case). If that’s the case, I could then use the ribbon cable Ground wire (for L3/R3) and VCC wire (for the Port LEDs)…right?

This is making my head hurt, so thanks in advance for your input.