I'm just about to press the button on the ballscrews and round rails so would be interested to hear where you got your linear rails from as I might bite the bullet, pay the extra, and get these from the outset. also I'm going to get a PDMX-126 BOB so give me a shout and I'll order one along with you and perhaps we can save some carriage by getting 2?

I keep meaning to have a play with Linux but I've been out of playing with PC's for years now so probably know enough to get me into trouble but not out of it!!