I had got a couple of Ruined Factorum sprues that came with Warhammer 40000 Imperium 34. The ruins are from the The Battlezone: Manufactorum – Sub-cloister and Storage Fane kit. You get two more corner ruins, all coming on a single sprue. I did manage to pick up a second magazine and decided that I would convert them. It was a relatively simple conversion swapping over the corners.
I then drybrushed them using Citadel Dry paints. I first used some Dawnstone Dry Paint and then a lighter drybrush of Terminatus Stone.