Sounds like some good questions to ask they guys selling them.
Good luck!
Hmmm, they aren't answering e-mails, it has only been a few days, so I'll still hope for a response, if they don't answer though I may just go with a non joust blue and yellow ball top, seems like those are fairly common (would be fun to get the joust colors, but can't seem to find any other place than the one listed above that has them).
We spent this weekend working on the cabinets (the number we're making seems to keep rising). We are now making 6 total (1 for my brother-in-law, one for my broghter, one for my cousins kid, one for a kid in my church's youth group, and 2 for me, I am finishing one joust, and will probably finish the other one as a robotron later on, figured I ought to make another one while we're doing this assembly line style since it's just as easy).
Most of the other cabinets are getting a custom control panel on them (cut the sides to allow for a bigger control panel to be bolted on, like lusids design), but my 2 and the kid in my church's youth group are sticking with the standard control panel (I think it looks way better, and I already have a big mame arcade that plays all the games). We have go almost all of the cabinets assembled to their base, top marquee, and kick panel installed. The rest of it should go pretty quick now. I'm sure I'll post about them in the project announcements once I actually remember to take my camera with me when we work on them.
Thanks again for any help you can give on tracking down the right controls.