Yes Matt, the first step is the Osprey books, and I usually look at the photos to finish the decals. I do not know why, but many times I have found serious mistakes in the Osprey color profiles comparing to the photos of the real machines in the pages of the same book... One the largest mistakes already found was the profile of Fritz Rumey's Alb D.V: If you observe the color profile (showing the left side) and the photo of the real airplane (pg.22, showing the right side) you will see that is impossible to join the two sides... aviation arts are very beautiful to see, but those artists are not modelers, so they do not have the commitment with the authenticity that we have...
The 1/32 scale is a sector that I am tried to reinforce, therefore I believe to be a great scale for WW1, but I will not leave the smaller scales (I am a 1/48 modeler)...
P.S. The images showing the instruction plans is already available in my website:
Spad XIII 1/32 decal