I worked on getting the key shapes for the base of the building figured out. I'm not very good at getting objects made by using math, I prefer to create some "beta" items using cardboard first. Once I get the general shape done, I move on to working on getting the folds and angles started. Once those are close, I move on to transferring the shapes, angles and folds to foamcore. That's where I am now. The next step will be to get my measurements and create a precise, reproduce-able template on the computer.
I'll go through those steps for all of the parts of the building. Somewhat time consuming, but makes the final product something that is easy to reproduce and very sturdy to play with.
The two pictures show the steps I went through on the main folds for the corners on the building and where I stand with the final folds on the bunker.