I have actively started research on Chronos in detail a few months ago and ordered the first parts about 1.5 - 2 months ago. In the last couple weeks I was basically waiting for all that stuff to arrive.
The thread in the Timescapes forums: http://forum.timescapes.org/phpBB3/viewtopic.php?f=24&t=10188
Thanks to Chris, I was able to answer most of the questions I had.
I'm also blogging about the project and trying to make it easier for photographers/filmmakers/DIYers in Switzerland/Europe to build their copy, because everything here is very different in regards to parts etc.
I'm running into a problem right now though. I have ordered a TR8x1,5 (8mm diameter, 1,5 pitch) lead screw, 1250mm in length, from Igus Switzerland as well as a fitting anti-backlash nut. Though, apparently, I have ordered the wrong nut (without flange) and they do not have the right one (with flange) at all. So the one I have now is practically impossible to screw on the nut housing I ordered from Chris or directly on the carriage, since it has no flange.
After hours and hours of googling, writing emails and making calls, I still haven't found a good solution. I'd like to keep my current lead screw, and I'd prefer to use Chris's nut housing, though I can live without this. There seem to be a couple (not many, not in Switzerland) flange nuts out there, though they don't fit Chris's nut housing.
Therefore I'm thinking of trying to find something like this instead: http://qtecstore.com/pages/leadscrew_nuts.html
They don't have any 8x1,5 there but only 8x1,25 and 10x5, but maybe I'll find the right one somewhere else...which I could then - hopefully - screw to Chris's carriage and go without the nut housing. I'm a bit concerned though, that this won't fit because the height will be different and I'm using Chris's end brackets.
What do you think?