My neck hurts just looking at that seatbelt with no head rest above it. I cannot turn my head more than 30° and I still have painful spasms because of the low-speed whiplash I got 54 years ago in a car with no head rests.
Planning on doing a similar design for our 118". We need a bench seat, but also need a 6' bed. We had a bunch of requirements and spent hours trying to come up with some fancy design, in the end, this was the easiest.