Those obsessed guys are not in agreement with each other. Bernd Schneider believes the visual evidence in Voyager confirms the official Doug Drexler concept of it being an upgrade of the standard cube:
Visual evidence from VOY: "Unimatrix Zero" supports the assumption that it is of the same size as a 3km cube variant 2.
You're conveniently choosing to ignore this interpretation, despite the fact that it's the one that most closely agrees with onscreen dialog and the creator's actual intent, and go with the one that supports your original assumption. That makes you look awfully stubborn.