Well, I've finally modded my Hori FS3, one of the hardest sticks to mod. Now I need to put art and PCB (PS2, PS3 and PC, because I play GG, MB, etc.).
Joystick: Seimitsu LS-40-01 (Red Shaft Cover and Bubbletop)
Pushbuttons: 6x Seimitsu PS-14-D-N (Black Rim/Red Button) + 2 improvised start/select pushbuttons, all screw-in
WIP mod images: