Brett,
The rails sound great and will have to look into that program for bidding. Would help greatly especially since i just lost a bid overnight on a perfect ballscrew mainly because it was finished at 3am last night. Even tho it asks for your max bid i hold off a bit before hand. Ah well many more to come im sure. As for rails im only after some short small rails for a z axis. I obtained some old stock a while back and they are 25mm rails. They will be perfect for my next 2 machines. I have just started my blog on my second and wont be long till the 3rd.
Where did you get your ACME screw? Did you get them from widgit too? As for the lovejoy couplers. Surprisingly they arent much dearer than the ones from Jaycar. I dont want to drop names about who got them for me but if you browe my first machine build im sure you can find out who and talk to them about where he got them. I think they were $17 each. You might need a lathe to bore them out tho if you want a custom size bore. There are some helical bellow type couplers on ebay but the loveloys would be much better with the flexi coupling.
http://www.industrialbearingsupplies.com.au
These guys have them but i dont know prices. Also there was a company in sydney that i saw once that had them and can only guess that tea transmissions and NSK would probably have them too, but not sure about price, im sure they might be a little dearer.
Daniel