1. The desk part is the back of the piece, so that’s easy to use; you always have this overhang on the back of your couch. That does severely cut down on the transformation time I was imagining.
2. I don’t think that narrow ledge really qualifies to be called a desk. Although there is space for file cabinets under the ledge, that’s a plus.
3. The bed is what 7 inches off the ground? If you want to sleep on the floor, buy an air mattress. (it can be stored under the back of the couch)
4. I like the natural wood; it just begs for personalization. I imagine different stains & colors making a very unique look.
5. The tyvek idea is great. I’ve used tyvek for mailing; that stuff is tough! I think it would stand up to anything except intentional damage.

All things considered; I think this is great if you have very limited space & want your furniture to multi task. I could imagine it in a small apartment or dorm room. Sturdy & practical.