While the PS4 downloads moar gamez.........
The player 3 and 4 joysticks have been previously addressed by PL1. Orient them properly and you can even use the damn things to play Smash TV acceptably.
As far as how the pedestal plays, here are a few notes.
The toggle switch under the control panel has been a godsend for idiot proof admin functions. When I flip it over to the mode that allows analog stick emulation, the EXIT button converts into the CoinOps config menu button. So, you flip the switch, thump EXIT, make whatever changes you need, flip the switch back and turn the cabinet back over to the people playing it and you can ignore the cabinet. I am a firm believer in not having any admin functions readily available.
Arcade games are meant to be played standing up. If you're sitting down, you may as well be laying down. If you're laying down, you may as well be holding a controller, and if you're holding a controller, you may as well be playing on a JTAG/RGH Xbox 360 that allows you to easily turn it off and on and flip over to vintage Cindy Crawford workout videos from the comfort of laying on your back.
If you want to sit and play these games properly, buy a stool. This control panel is actually fairly high so I don't have to hunch over it.
Would I do anything different?
1 - I'd top mount the joysticks in a recessed hole that have them flush with the wood. Undermounting them when you don't want visible carriage bolts is a mistake. I think at the time I was skeptical I'd be able to scrounge free artwork.
2 - I'd move joysticks for players 1 & 2 and associated buttons about an inch higher up the control panel. I'm a big guy, and I'm used to the middle of my palms digging into the edge of the control panel. The answer to why I went with the "this is what feels like I remember" barometer when I was in control of everything continues to elude me.
I still flip flop on the location of the credit buttons. They're aligned relative to each individual players buttons rather than symmetrically laid out relative to the dimensions of the control panel. So it's very easy to slam on them during a multiplayer game but they look a little off when nobody's playing it.
And if you do build one of these things, brace yourself for spending some money. I squeezed this as cheap as a person can and we're still in the $600-800 range. This is NOT a $50 beater JAMMA cabinet with a JPAC and dumpster computer thrown in it.