Re: Floor: Floating or not?
I ended up leaving the sub floor without screws, then laid down 5" and 6" hickory boards over that. Glued AND Nailed down the hickory floor (with gaps around the sides / also have gaps in the sub floor) Floor feels very solid, already built some kitchen cabinetry and put in a claw foot tub, which should hold it down. I'm fairly confident that the sub floor floating will not be a problem, but will update this thread over time.
I feel good about not having extra rust points in the floor.