I also use a non-vector software, but it's Gimp, not Photoshop. In my PZL P.11 I had layers for (from the top): wires, white background (on top to mask some things), shadow, glass, tires, 8 laiers of lighting effect on different parts of plane, weathering layer (made of about 3-4 merged), 2 layers for rivetes, one for effect of corrugated sheet on tail, one for colour difference between fuselage panels, machine guns, leather in cockpit, two for texture, unseen lines, which on profile was based, and 11 layers for three different colour schemes. It's good that I keep all that files on my computer. Also: I know what you mean Logan, when you sey, that "layers goes wrong": I've had one that incicdent, with one of my WW1 profiles.