How much hot racking in the Guppy’s?
None. AFAIK, all the old fleet boat (Gato class) crew had their own bunks. Mine was in the forward room, atop a torpedo and next to the bowplane motor. Interesting times when the guy on the bowplanes put them down so much they hits the stops - big blue flash gets your attention every time.
Forgot about the hot-bunking. I understand the Brits did that even on their corvettes and maybe destroyers.