There's no "Rotate Snap Image" function

[Justanother1]

uuuuuhhhh...... Yes, Snap image can take a screenshot, and there's a AutoUV option for Projection-Camera, but I don't see how the one can help the other? You can make a Template from the UV-window buy printing the edges, and you can have the background be Alpha-0 and save a .PNG for an overlay. However, Projection UV-maps are not un-folded right, the spacing is sloppy. And if I'm understanding correctly, your using a Image Editor for Texturing? You can get Sculptris or Blender and paint on your model, using small grayscale "Alpha Maps" to add Bump-map chunky surfaces, it's quite fun, and works way better than trying to guess in an Image editor.