Fantastic job on the restoration of this CSW! Just following up after finding this thread back in March.
This may or may not be of interest to you, but re the rear window tracks, these are usually felt. Felt traps water and overtime rots and grown moss etc.
Rocky Mountain do rubber tracks as an alternative. Ok it's not original -and at £80, and investment; but it also means that you won't be replacing the tracks in x years...
http://rockymountainspares.co.uk/product/window-track/
Guide about replacement - although you know these vehicles inside out now
http://www.expeditionlandrover.info/LRsideWindow.htm
I also have a Russet Brown County, so if you need pics for ref or info, let me know. cheers
#brownisbestcolourforseries3