This is a mod of 4-speed compact linear gearbox by:
Sariel that can be seen here
and
MisterFitzGibbon's 90 degree turn mechanism that can be seen here
I will post instructions and video tomorrow
Picture here -->
PS: rubber band connects two purple ends that is missing from LDD
Cheers
Here as i promissed, pictures, video and instructions...
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=488113 (link will be up soon)