Hello Patrick:
It looks like you are making good progress. No worries on the control inspection windows, just ensure you mask them off well prior to painting. As Des Mentioned just ensure your control horn attachment points are facing the right direction. I pinned mine with brass wire, it helps a lot with rigging and handling as you can leave them off until you actually need to rig them and you can put them on and off for decaling as well. In fact, I pin all of my control surfaces now just for that reason. It is easy to do and really saves a lot of hassle with glueing and knocking them off later.
Good Luck, you are doing fine.
Best
Mark