My panel now is similar to the SUPERCADE PANEL except that it isn't two levels and there is a real Tron stick instead of an analog flightstick.  I mis-judged the placement of some buttons and one stick, so I find it to be not as player-friendly as I wanted.  With all the new stuff I bought I am going to come up with an interchangeable control panel system.
Here are the panels I could populate with all this stuff:
1.  Discs of Tron
2.  Ikari Warriors
3.  Williams Multigame (also for asteroids)
4.  2 Player Fighter panel with a 4 way joy in the middle
5.  Trackball panel for GoldenTee, Shuffleshot, Schuuz, & WC Bowling
6.  Star Wars Yoke Panel
7.  360 Steering Panel
8.  270 Steering Panel
I had considered making a rotating panel like 1up, but there's too much crap.  I would just build 8 different machines, but the computer and monitor costs would be too much (plus my wife would throw me out of the house).