This machine is under heavy development. It is currently (as of March 18, 2010) in a third design iteration, and about to start #4. Once the design begins to stabilize, I'll add more information.
Some progress pics:
T-Rep 2 <flickr>4393527759|none</flickr>
T-Rep 1 <flickr>4379919116|none</flickr>
T-Rep 0 (the progenitor, not T-slot) <flickr>3951997454|none</flickr>