It looks as if it might be of more interest to 1:6 and larger scale builders, but could be scaled down. Here's the designer's website:
http://members.upc.nl/i.cerjak/CG.htm
It can be made with off the shelf gears, and basic tools, apparently- but access to a hobby lathe is recommended.

Personally, I prefer the planetary gear type of arrangement we've seen of late..