This is my custom made replacement for the PCB in the Xplorer model of Guitar Hero guitars.

Essentially, my guitar was stuck in some weird down-strumming state when playing Clone Hero. So I took the back off of the guitar and using a multimeter I figured out that the connections between the ground and the down pin had a slight connection even when the switch wasn't depressed... so I investigated further... I found that my PCB was corroded which was causing a short between the pinholes.

Rather than trying to buy a new PCB I opted to un-solder the switches and directly wire them to the main PCB of the guitar. I tossed the PCB but kept all of the other plastic bits that connect the switches to the hub (the switch-bracket, the two side pieces) and created the attached 3D model which mimics the size of the PCB - just with a slot for the pins of the switches to go through.

There are definitely some ways that this could be improved but tbh I put it all together, screws and all and it's working perfectly! So I decided to post here in case anyone else is having a similar issue. Hope this helps!