Here you see how the bunk can look with a mattress and quilt all in place.
You can also see I've been experimenting with lighting, though that's not by any means a final decision.
I can report that it's extremely comfortable to lie across the bunk, up against the curve of the hull, reading.
Further testing reveals the need for bedside shelving, to store essentials such as cups of tea and phones/music players.
Oh yes, and some kind of storage close to hand, for current clothes and suchlike, would also make life so much easier.