I'm interested in either of two numbers. The first number would be the empty space volume that the crew walks around in, presumably including restricted access spaces like the Jeffries tubes and space inside machines that engineers and technicians occasionally work on when Shatner is hamming it up on the bridge.
The second number would be the volume if all the internal machinery were removed and it was a shell composed only of the hull and maybe whatever structure was necessary to keep it from crumbling under its own mass.
The length/width/height are well-known, but given its irregular shape I m having difficulty deciding what the volume itself might be. Has this ever been discussed or written down, or is it calculable?