The rails came from eBay a seller called fa-system. All told they cost £484, the same kit from Zapp would be £683 (not sure if that Zapp price includes postage). As far as I can tell the rails are still in tip top condition. The Z-axis have clearly seen a harder life than the X and Y which look almost brand new, I'd guess they all still have a ton of life left in them though.

I like the idea of buying the BOB's together, I'm pretty sure that's the model I'll end up going with but I want to have a bit more of a read first. I'd guess I would be looking to order late next week if that's ok?

Have you had any thoughts about spindles? There's an eBay seller "happykisssoul" that's shipping 2.2kW from the UK for a good price (even including insane shipping costs). I've seen a couple of guys say they have bought from him without problems.