I was reading about the various TransHab proposals (at http://www.astronautix.com/craft/traodule.htm, among others), and I started to think about pushing the idea to its limits. Assuming you had a large enough payload area on a rocket (or space shuttle - once upon a time), you could launch some pretty big modules. Most of the plans called for multi-"story" modules, with different levels. But a much bigger, simpler version would, of course, simply have no levels, and be just one giant cavity. Reminiscent of Star Wars landing bays, right?
But there's a catch. Most (okay, all) of the modules for space stations over the years are tight, cramped, and not for the overly claustrophobic. One upside is that you can pull yourself around using bars on the "walls". In a large, cavernous module, that would be hard (unless you plan on using an MMU all the time!). Artificial gravity could make this even worse, by trapping any astronauts on a single side!
So my question is this: Is there an upper limit to the interior of space stations because it becomes impossible to move around in a controlled fashion? Are space station modules doomed to be thin and cramped forever?
Note: I don't think that this is a duplicate of Are there any theoretical size limits of man-made space stations/structures?, simply because I am interested in the interior of such a space station - my hypothetical module could simply be the size of a gymnasium and still be of a problematic scale, as opposed to the miles-long structures discussed in the other question.