Why not? And hammocks themselves can be anchored with teared energy absorber like used in via ferrata mountain climbing — https://en.wikipedia.org/wiki/Via_fer

Why not? And hammocks themselves can be anchored with teared energy absorber like used in via ferrata mountain climbing — https://en.wikipedia.org/wiki/Via_ferrata#Energy_absorber https://en.wikipedia.org/wiki/Via_ferrata#Energy_absorber . This will make the construction much safer than a single two-point seatbelt. Going to the restroom might prove to be somewhat challenging, though...