Windows

1. Windows will be double glazed and altitude-proof. (KCT or https://www.outbound.eu/ )
2. Windows/doors will be flush-mounted to the box, to enable the top layer to go over the bottom layer.
3. Sizes/numbers are still to be determined. 
4. I am quite enamored by the idea of having a 'strip' in the middle of the ceiling, at least in the kitchen/seating area, maybe not in the bathroom/shower due to the need for an extractor fan.