My first effort at a potential layout.
This is for short stays, not to live in at this stage. The entrance is one one curved side (assuming suitable corrugated flashing can be obtained). The hallway is probably going to have a standard height ceiling, but the other rooms vaulted to follow the curve of the outer roof. The bathroom opens off the hallway on one side and it goes through to the main room. I put a 'breakfast bar' type table next to the kitchen area, since there didn't seem to be enough surfaces to me. I wanted the sitting area to be in front of the big window at the end for the view, so the dining area ends up to the rear.
If we do put a fire in (for back up and because people like to play with fire) I thought a tiny batch box on the dividing wall might work.
The bedroom looks the opposite way with a large/tall window for views again.
I need to do some cross scetions to scale yet, to check for headroom at the sides. It might be possible to lift the whole structure up by a foot or so to give more height, but I want to avoid this if possible.
Any thoughts on practicality at this stage?