Wow, thanks for all the great advice. I didn't know if I'd get any responses or not.
Right Side:

The left stick is a 4/8-way (pull and turn to select), and the right stick is a Tron Cocktail trigger stick. Another spinner rounds it out, making this a playable layout for Tron, tank games, and a bunch more. The volcano buttons light up for 1p/2p start.
Hella cool! Your setup looks incredibly flexible. I had no idea they made a cocktail trigger stick. Used market only I suppose. I found one listed at arcadefixit. It looks like a duck.

I was actually planning to use the Ultimarc MiniGrip. It's 4.7 inches high so I was hoping to hack/lower it a couple inches if I can find a way, undermounting with some kind of spacer maybe. It looks like this:

Do you like the magstik plus? After reading Saint's chapter on sticks I was left with the impression that it was the one to get. But I've read so many negative opinions on the short throw. Most games I like are 4 way only so switching for me may be rare. I've got my sights set on the ball top J-stick, partially on considerations of cost.
Sounds like someone's up for some TRON. That configuration actually pretty creative even for a cocktail that wants to play that too. The buttons though should be better arranged for easy access. Unless you plan on older games and shmups, it's not terrible, but that also depends on your hand orientation for the most comfort.
Hard to believe, I'm actually most anxious to play Zwackery again. !!!

... I would like to recommend that the OP looks into doing a wireless hot-swappable TRON stick on an auto rotatable 4/8 way joystick ...

This is my first build ever. I'll have to do some research to even understand what you're talking about!!!

...This would save a stick and give more room on the CP for pesky things like buttons side by side rather than stacked and maybe even four of them for some rockin' SNK action. Other than that I think the spinner may be too close to the far edge for comfortable play, not that it needs to be centered but maybe just another inch over. Also the stick can be centered and all the buttons on the right of the stick for a more standard configuration but that is pure personal preference.
Good suggestions, thanks! I didn't even realize 'buttons on the right' was a standard. Laying in bed thinking about this before going to sleep the night before posting, I was trying hard to remember which games you use your right hand and which ones your left hand. It probably seems bizarre that I don't even know that.
Much over 12" in width on a cocktail starts to get uncomfortable. Your legs will be pretty wide straddling it. I made the mistake once of going 15" and was really unhappy with it in the end. It presses inside your knees.
Thanks for the insight! I'll see if I can do it in 12".
It looks a tad crowded. I would delete the two buttons on the left, move the stick over, and line up the two remaining buttons (which are all you need for most 80's games) so they're next to each other horizontally, as they are for "regular" arcade games. I'm guessing you're using a cocktail-style trigger stick?
Left buttons to be deleted. Right buttons to be aligned horizontally. You're the 2nd person to mention that so it's a glaring issue. Also the 2nd to mention cocktail-style trigger stick. Like the duck above? Anybody still making these?
Of course, this begs the question of where you're putting your admin and game select buttons...
Hmmmm. Good q. Side panel maybe? Above knee height. Clearly I have no room left on the CP.
Guys, thank you all. This will help me from making some regrettable decisions. Revision in progress...