You will see all kinds of goofy stuff in pictures, for instance a beaky appears on the back side of the cover of Prospero Burns. What you generally find is that no one is truly 'accurate' when it comes to the Mk patterns of the pre-heresy armor. I have spent a good bit of time researching this project by looking up artists renditions of the different legions usually found on the book covers of the Heresy series, other hobbyists work random depictions and so on. Now keep in mind that my experience in this sort of basing is limited to Flames of war 15 mm stuff, but it's all the same in theory, so we'll see how I do. Also the fact that most of this stuff is made of terrain plaster, it's easy to break up. These are all pieces of plaster molds of urban building rubble and random crap, but all good for the look I'll be shooting for.