I’ve modded 2 of these with happ sticks and psx board and am supposed to mod another one of these. I would recommend if you are going through all the trouble of modding them, might as well put the happ parts in there. Go with competition stick and competition buttons. When I first started out, I used Ultimate stick and Ultimate buttons and then I regretted it and I had to remod them with Comp parts. Also, of course the hardest part is putting a new psx board in there, even I’m lazy in starting that third stick because I don’t want to bother with the soldering. I would recommend soldering the boards instead of the A-series non-solder hack since it will be more reliable. A trick to get the pelican open, the plastic box where the cord goes, unscrew that, pull that entire black box out carefully, unscrew the bottom screws out, watch out for the screws under the rubber feet, now once all screws are out, push your fingers down through the rectangle opening and push the bottom board out. Be careful though, its a very thin piece of mdf. Uh, I’ll take a few pics of my finished mod and the insides to give you some guidance. PM me your email. Also, I did the SFAC stick mod with comp parts too but no new board. Well let me tell you the buttons are easy, but I had the hardest part putting the stick in because of those screws. I opted to not take the art or front off, so it was difficult getting the bolts not to spin. Lets just say, I had to drill into the bolts so I could insert a screwdriver so the bolt wouldn’t turn, then I could get the nuts off.
Also, I got my happ parts from Pony boy on BYOAC boards, he might be a member here too.