John, about ten years ago I bought an 8×10′ piece of knotless (Raschel) Dyneema netting with roughly 1″ openings and 180 lb nominal breaking strength per line. It was for a catamaran trampoline, and I’ve now reused it in several other applications. I actually did string it up between trees and test it as a hammock material, but the openings are much too large. It’s uncomfortable. In my opinion, openings half that size or smaller (maybe 10 mm) would be the maximum size for a comfortable sleeping surface.
If you find a source for Dyneema Raschel netting with smaller openings, please post.