Structural Integrity

I've been doing some sketchwork on a scene I want to model, here's an early stage of the main development building.
Here’s a model I made of a building I had sketched out a while ago. The proportions aren’t quite right yet, the building is ultimately supposed to be a hanger for very large aircraft. The sketch is much larger but I don’t want to give away too much too quickly.
The model only took a little while to make. The difficult part will be getting the proportions right. My todo list on this model is as follows:
- Resize and create holes for windows
- Resize walkway
- Finish modeling the water tower
- Model extras (rooftop fans, buckets a dumpster for the side of the building)
- Texture
- and anything else I’ve forgotten…
Maybe someday this model will see the light of day ‘fully dressed’, as it were.