Thanks for the interesting thread!
I have spent some time camping in a Hennessy Hammock and would suggest you try a single
hammock first to understand the physics. A hammock tends to have a low point between the two supports this usually is where the rump is. The sides of the hammock tend to wrap around the body. Once you get used to it this is a great way to sleep.
Envisioning two people in a hammock, bodies bent at the rump, sandwiched in by the sides....well that is the type of venue normally reserved for adult movies or if done tastefully old Abbot and Costello flicks.....
I believe when the concept
goes through the detailed design phase, the R&D team will abandon the project