The odd thing about this tank is that it was in that part of Tunisia that is more temperate and doesn't really seem to have as much fading as it does dirt and grime. The photos of it "as-found" show mud on the tracks with trees and grass around it. This is the reason for my study, getting the weathering done correctly will have a lot to do with the historical accuracy of the build.
This photo, as best I can tell, was taken after dad's guys got it operational for test-drives:

Tunisian Tiger I (My Father's Tank)