hey, das me!
yes... the motherboards are specific to golden tee and silver strike. it's not a proprietary board and is available commercially as a standard desktop board anybody could have bought.
BUT the OS is linux and has the specific drivers needed for those boards built in. so you can't just use ANY board, it has to be the one that IT put the drivers for it in the actual OS. or something VERY VERY similar to it.
Linux isn't like windows, where if you change the hardware, the OS will just try and load the drivers it needs. The OS for the games is stripped down to reduce load times (and for a somewhat proprietary-envess.) so if you change the hardware it just fails to load.
there is also an issue with security....
there are 3 things the games need to boot...
a cabinet ID - AKA (CID) (usb device) tied to the game itself (either bags, golf, bowling and not compatible with each other)
An IO board (usb device)
A security key on that IO board (IC chip on IO board.) again, tied to the game itself (either bags, golf, bowling and not compatible with each other)
While not impossible to build a system yourself out of parts, I will tell you right now, a CID (if you can get IT to sell you one) is $2200.00 USD... it's also $600.00 USD for the IO board.
also the "KIT" to use the 2 games in 1 machine is just switching hardware to flip the JAMMA. you still need the computers, IO boards CID's etc. etc. etc.
you are quite really best off buying just 2 machines.