Have a look here
http://www.network54.com/Forum/110741/message/1115211754/
Although the pics are no longer active, the modeller masked off the azimuth markings on the turret sides of an RMASG Centaur
His reply about his method:
http://www.network54.com/Forum/110741/message/1115289257/About+azimuth+markings
Perhaps email him directly and ask for a peek at the images. It is a very impressive model