try Brims Plywood as they have a massive range of plywood and can custom lay/make it with clean outer layers
I just tried to Google them and I got a post from 2008 talking about a "Brims" in Queensland closing up shop, and a few results for a "Brims Wood Panels". It's probably just my severe lack of sleep, but could I get a bit more info on these "Brims" guys?
Troy and Jason from ArcadeWorX will be in Melbourne on Monday so I've managed to snag some time with them to go over the final cabinet design. I'll bring the plywood question up again and see where it takes us. My concern is longevity. I know an MDF cabinet will take a beating and a half and not even notice, while ply tends to go balls up pretty quickly in humid environments or if it gets wet.
Plywood would certainly give a more "classic" feel but I'm not convinced it's the best choice for the retail models (especially since finding a reliable supplier of non-warped ply seems to be so difficult).