Make sure you get a cabinet with a standard resolution monitor (15khz) or one that is tri-sync, if you are going to go with a jamma switcher.
Heres the info I collected on it:
https://forums.arcade-museum.com/showthread.php?t=271012I disagree with the above poster about the multi lightgun not being a good project. I think the multi jamma cabinet was an extremely worthwhile and rewarding project. Aimtracks are not accurate enough in my opinion, and there are only about 20 lightgun games worth playing. There is a user developing a 8 JAMMA pcb switcher and when that drops you should easily be able to cover all of the (actual, HAPP45, beam-based) light gun games you want, 100% accurately with 100% accuracy in any cabinet with a rgb monitor.
The thing about light gun games though is you have to understand that some games use a beam timing circuit (LE, A51, Point Blank, Police Trainer, TurkeyHunting USA, Time Crisis 2) while other games use an IR sensor (HOuse of the dead 2, virtua cop, Jurassic park, Time Crisis 4, ghost squad). You need different guns for each group,
Sega is pretty much the boss of the IR gun game world and games made after 2000 tend to need sensors,
pretty much anything up to Time Crisis 2 will work with the HAPP 45 guns
also the 3-in-1 gun kit you mention, those are not aiming guns, those are mounted guns, they actualy work like loysticks to aim. think revolution X or terminator. these guns tend to use analog controls like spinners or POT's to determine gun location, for the most part, they are NOT compatible with the handheld gun games mentioned above.