I finally finished it!
Here's a top view. The blobs on the rigging are the turnbuckles. They're made from chain links from a 1/350 scale photoetched anchor that I made. Note the big gun on the starboard side:

Here's a better view of the "Gotha Buster". It's a 4 barrel small caliber automatic Gatling gun powered by a reduction gear coupled with the engine. The gun was suggested by Georges Guynemer as a way to destroy the large Gotha bombers quickly. While the bullets were of small caliber, the gun was able to deliver a large mass of bullets to the target in a very short period of time (I need a better name for the gun, guys!). The gun had a tendency to jam if more than 80 rounds were fired, so the magazine was limited to 80 rounds. A single standard aircraft machine gun was mounted in front of the pilot, with a much slower firing rate but more ammunition:

Here's a front view with a 1/72 figure for scale:

And here are a couple of "beauty shots":

and this one shows the sun shining through the rudder - completely unplanned and unexpected, but it makes it look like it's really made of fabric:

I added a PE gunsight ring to the center gun, but it's not visible in any of the photos I took today.
I have a few more images here.Overall, this was a really fun project, with few - if any - serious problems.
Frank