So here is the Rubicon M4 Sherman I base painted and with the decals added.
The decals will have a small amount of "chipping" using Vallejo Russian Uniform Green, This will also remove the rather prominent white line at the top of the 33rd Armoured Brigade's Diablo logo.
I have not been able to work out how the numbering system works on 144 RAC vehicles, the tank numbered 66 in British Tanks In Normandy and the Dennis Oliver book is from B company. I am going to assume that the numbers reset per company.
This tank is number 21 of C company. The font is not quite correct, I have had to use the (US) numbers from the Warlord M4 decal sheet.
The pistol port probably should have been removed (which would have assisted the number positioning).
Nothing has had a wash applied yet.
The spare wheel is rather prominent, it might need some additional mounting clips.
I removed the cubes of square section plastic rod that were holding the tow cable down and superglued the cable into the existing clips.