I am looking to have a Control Panel of 2 players with 6 buttons. I also want a trackball (Golden Tee/Bowling) and a Tron stick and spinner. I assume that is do-able am I right?
Yes, absolutely it's doable.... BUT you should strongly consider if you
should do it all on one control panel. Unless it's a large panel you might find all of that a bit too much for the space.
If you really must have all of those then why not make swapable control panels.
Either the Ipac or the Keywiz will easily accommodate 2 player six button layout. Personally I'd recommend the Keywiz. I think it's better value for money and for me it works well.
Galaga is also one of my all time favorites so would a separate 2way be needed or would a Happ stick do the trick?
Galaga plays fine on any stick 8 way 4 way etc etc. But you might also want either a dedicated 4 Way stick or a switchable 4 way/8 way, for other games like Pacman or Donkey Kong and quite a lot of others too. They don't play well on regular 8 Way sticks, as you can get stuck, as you go from one direction to another and accidentally hit a diagonal.
Best Regards,
Julian (Fozzy The Bear)