Of course we can see this together! I will send you more photos later and analyze further.
 

The F355Dx when I bought it was without the 31khz screens and was missing some parts, I had to disassemble it entirely and recreate some wooden parts based on the manual and photographs, as I said before the Naomi Multiboard was working well in the beginning, but two of the four naomi had already been tested before, so I left only two to run the game on the rack, I installed 3 32" LCD screens and increased the width of the cabinet base to fit the 32" screens, I made adjustments and basic maintenance and it worked well for a while, my question is about the machine's original connections to the Mega Adapter F355 + MultiFFB, I have no idea how to use this, forgive my ignorance, thank you very much for sharing my projects here with you.

This is my f355 DX, it works perfectly, but only with two naomi, two others I need to review, putting a PC here without having to remove anything would be perfect!

Hello Tibal, a question for a layman like me, if I want to play f355 challenge 1 and 2 will I need a multiFFB? I would like something plug and play!

Hello, I have a F355 Dlx with Naomi with a problem, it is complete and working and I would like to purchase this PCB to use a PC instead of the multiboard, will it work with flycast? Congratulations on the incredible project!