Ok, cabinets are a bit tougher to get in the UK, so it MIGHT be better to build then (although there are a bunch of UK collectors on RGVAC, so they must be out there somewhere). It seems that Fruit Machine cabinets are easy to get though, if you like that style of machine.
I wasn't actually thinking wood cost when I was talking about the cost to build a cabinet. The actual cost i was talking about was coin door, control panel, t-molding, t-molding bit for router, router if you don't have one, glass, plexiglass, locks, marquee light, speaker, grills, brackets, etc, etc.
I don't THINK used computer prices are much different in the UK as compared to the US though. I usually pay $20-$100 USD for my Mame PCs. Which is A LOT less than