Are you keeping the roof square overhanging the tank ? With the beams notched you have a built in ventilation louvre all round. Bit of wire mesh at strategic places and you should get a nice crossflow of air.
Door, cut out a hole with diamond saw, drilll and dynabolt the frame in.
At a later stage when you figure out what you're doing with a pier I'd put a false floor in around it to isolate and vibration and get you up to a usable height.
Any idea how thick\solid the tank floor is ? You could always section out a piece with a concrete cutter to isolate it. Seal the gap with Silastic against water etc.
So many options !! So much fun !!
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