The D.VII is looking good, Waffle!

Just a couple suggestions:
- As it has been mentioned, the pilot looks quite big/sitting quite high.

Maybe it could sit a bit lower?
A pic:

- The turtle neck behind the pilot should be a bit shallower and reach from one fuselage side to the other. As far as I know the basic fuselage geometry remained the same in all production batches as far as the turtle neck is concerned.
A pic:

There are lines in the top projections of some drawings from where one might mistakenly interpret the geometry to be like you've depicted it but the lines actually show edges where the top rear fuselage plywood decking ends. It was flush with the rest of the fuselage, though. (Also note the asymmetrical positioning of the vertical stab.)
D.VII will be my ride in the skies of the Great War.