Thanks for the input guys! I really appreciate it.
I've been working on how to finish off the fuselage top and there are some issues I will have to deal with.
Here is the drawing that I am working from. The problem is that large center gun ring.

None of the pictures of the real aircraft show this arrangement. The drawing seems to be fictional (or based on a factory drawing that was modified at a later time?). All of the pictures I've seen have an offset to port center gun ring/station. Not sure, but again, I'll be going with the pictures as best as I can. Here is an early G.I version with a seat but no gun ring.

I've decided to do G.I 42/15 "Feodora". Here is its gun ring arrangement.

It looks to be offset with a modified section that hangs a little over the fuselage side to accommodate the gun ring like this picture.

And a side view, maybe not the same aircraft..

A little more thinking and experimenting and I'll be back with an update.
Thanks,
Mark