I've been thinking about this project again recently. At the moment I'm not entirely sure if it will happen next year like I hope as the job I'm currently trying to persue (programmer for Microsoft's Xbox Live development team) will send me quite far from my parents and a set of Clone armour is not the sort of thing I want to have to transport along with all my other bits every year when I move into a new house to continue my degree.
However, I have found some more useful info. In the art book that comes with the Clone Wars season 1 DVD box set there is q page which has Clone concepts of Cody, an AT-TE gunner and a Clone Pilot. The pilot and gunner only have helmet shots, however in all 3 pics it has the RGB values for their armour. The pilot has an RGB value of 220, 185, 70 for the yellow on the top and 99, 53, 53 for the Republic logo on the sides of the helmet.
For those who are interested the AT-TE gunner helmet has 73, 84, 87 for the grey on the shoulder and chest plates; 153, 143, 113 for the grey on most of the helmet and 116, 116, 98 for the grey on the back. The orange on Commander Cody is 202, 135, 44.
Oh yeah, as a side note, I've also been thinking about Sergeant Kano, a trooper in the 501st features in Republic Heroes, and have been wondering about doing his armour as a second project after the pilot one. I might get an early start with one of those voice changer helmets and paint it to look like his helmet.