Hello @KwilohJim ,I have only spotted this after reading your report, I'm already well past this part of the build, I can't believe it, such a big error on Occre part! Your solution is a great idea but maybe leave out the middle window as I believe this is not on the original Endeavour!
Below is a contemporary drawing (a rough sketch actually) by the ship's artist Sydney Parkinson. It seems that there was some kind of a window-frame, but it could not have been functional because of the rudder post.
Since I did not want an empty space there, I chose to just 'blind' the window, more or less similar to the Freemantle replica. Other replica's, and many if not most model kits, do have a window there. Since my last post I have changed the decorations as well as you can see in the picture below, and I might also add shutters at a later stage.
The Freemantle replica.