Just a couple of quick comments:
The noses/tails of the ribs and the leading/trailing edges of the wings appear to be fairly flush on any skinless wings I've seen.
Quoting Philip Jarrett's article on 210/16, "The gunsight comprised a simple rectangular foresight with a horizontal wire carrying two beads 43mm either side of centre". No vertical wires at all! Seriously.
You already mentioned the extra span between the wing root and 1st rib, so I won't =D
Again, it's looking great! Post more soon.