For fun, I decided to try to simulate making a paper model using a 3D modeling program. I haven't tried to make it perfect, so it looks like it was cut out of paper rather poorly.
I'll probably spend a little more time on it to make the periscope tubes look more realistic -- that is, getting the the paper diagram to be drawn on them properly.
I hadn't realized that it had been so long since I last posted here. My life has been busy in other ways, but I hope I'll be able to create some new models and Addons for Celestia in the not too distant future.