You are probably OK for the short term (month or so) with that much water seal. You won't have any constant load on the floor I presume, since the walls are to sit over the perimeter foundation and the scope sits on a thick slab of concrete. You might want to put down a finish floor of thin, smooth plywood when it's all dried in, but not absolutely necessary IMO. The wafer board (OSB) tends to produce splinters with wear. You'll probably carpet it with some kind of I/O carpet anyway.
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