Nice one Alan, loving the cam,
if it helps i mix up a 'track colour' using a cheeky mix of the following
70% Tamiya Nato Brown
25% Tamiya Nato Black
5% Tamiya Flat Red
(the Tamiya Paints aren't written in stone..it's what i had to had when i needed a track colour..)
this gives me a good base for the tracks that will only need a bit of weathering to make them pop...HTH
That ratio is the one i've seen Andy's Hobby Store giving out. I don't have the Tamiya Nato Brown.....yet......