I started building my first cab this year around March (well, started gathering
parts around Jan-Feb but didn 't build until March). Originally I wanted to do
a 4-player cabinet with no trackball, but after reading The Book and interacting
w a lot of helpful friendly people on the forums, and finding a decent trackball
on Ebay, I decided to buy one.
And then promptly didn't do anything with it for 3 months. In the meantime,
I got my cab built, prototyped a 2-player, 2-joystick cab with no trackball,
and had fun.
Then I finally got a free day to finish woodworking on my final control panel
with 2 players and the trackball-install I designed, but didn't have the
computer interface yet. Again, looked cool but not functional.
Then this month I finally got the time to mouse-hack the trackball and
make it function as my computer mouse -- and omg I will never go back.
It's only been a few weeks but there's been a 4x improvement in the
"fun" of the cab... been having a blast just playing Missile Command,
Centipede, and even "spinner" games using the trackball. Plus, I
switch between using MAME and playing pinball games on Visual Pinball,
so the trackball is handy b/c it acts as the computer's mouse. -- Much
better than trying to do it w/ the real mouse I was using in the pull-out
keyboard drawer I made for my cab.
Incidentally, I haven't given up on my 4 player design... just modified it
so that I will add players 3-4 as attachment "wings" to the control panel
when I have 3-4 players come over.
Wonkalow -- see my website for how I did my trackball install, it might
give you some ideas. I was able to mount mine w/o a trackball
mounting plate (which probably isn't recommended by some but
I planned it out and wanted to see if I could do it) and I describe the
mouse-hack needed, albeit in less detail than the link I give on the
page. It's not the first webpage in my site, you have to follow a link
to "Trackball" from the menu bar.
Good luck! And feel free to PM w/ questions, you're not alone in
"first-time cabbing"!