Great stuff. Nice video.

About 14 years ago I had a custom mattress made which is just a quited padding wrapped around thin dense foam, far more firm than any commercial mattress. I used it for years. It was great. Really fixed my back, and sleeping in a soft sagging back with zero support is intolerable for me. But over time the firmness of even the dense foam broke down, and I bought the firmest commercial mattress I could find (which really isn't firm enough).

If I go to the floor now ... and I think I will... I'll probably start with a thin layer of dense foam (yes it probably leeches forever chemicals, but I'm a wimp and I want a little bit of padding).