Allen, after seeing this inner structure of the glider, and the way you design your submarines, I notice that you are making a real difference in the way paper models are designed.
While most commercial models of ships and planes used only a minimal amount of spars, ribs and bulkheads, you include a larger amount of these in your structures.
I like it, because I believe it is an intelligent approach to the structure. It parallels what was called "multi-cell" structure used in the DC-3 wings and other later airplanes. Is not exactly the the same technique, but your multi-spars and firmly placed bulkheads serve the same purpose: they spread the weight and the stress through several smaller structures all along the skeleton. That gives the final model an incredible strenght and resistance. And I know that! Destroying the first Savoia was not an easy task, it took a lot of time and effort. Other commercial models would not have survived at all.
Your kits will make models that will last longer than other commercial paper models. And not also that, your attention to detail produces really fine-looking products. I'm sure of that.
Also, seeing the screenshots of your design process is a most enjoyable experience.
Regards,