I prefer to make do with what I already have or can scrounge locally... I think "hacking" a good looking and functional cab will be more fun (and more fitting to my college dropout budget) than buying a bunch of premade parts.
So on that note, I'm happy to report that after spending the morning with my dad's metal grinding tools, I've scraped a lot of the rust off of the rollers and after emptying about half a can of WD40 into the suckers, they're rolling again. It's not like new, but it's better than the trackball in the local bar's Centipede machine, so I'll be happy with it at least for now.
Time to start reading about those hacks...