Painting the Archer

I have finished all the sub assemblies of my Archer and hopefully I can start painting tomorrow. Unsuccessfully searching for a good painting guide I chance upon a spanish hobby website discussing a finished Archer. The paint looks good but the seats inside the gun and the driver compartment gave me some doubt. The seats were painted in brown somewhat simulating leather or wood. Would that be correct for british armor? What color would the shell container be? Bronco for all its thoroughness left out the color guide to paint the interior. They only have the painting guide for the finished model.