RE: Story of Two StuG's
Outstanding texture on the rolled armor plates as well as the cast of the pig's head. I really like where you are going with this. I have the Panzertracts on these as well as some other StuG books if you need any info, just ask.
Another rust option if the solution is too much is putting some 0000 steel wool in a jar with some water and letting it rust. After a week or so, you'll have all the rust you need.
Looking forward to more progress.