wow i've been at it all night.   there's no way an led wiz is fitting inside. especially with a trackball and 2 spinners. i'm guessing if anyone attempted this they left it sitting inside the arcade cabinet somewhere. Trouble is if i had to remove the tankstick out completely that would have to fit through the hole in my cabinet.   and it will collect dust.

  i haven't even done buttons yet. just an led trackball upgrade.  there isn't much room in there. You can see where i tried.  I always strip a screw doing projects.
I realize the tankstick wasn't built for this for sure.