Habitat for who or what is another question to consider. I recall reading the suggestion that a mostly-infomorph habitat might consist of a few significant servers burrowed into a convenient hunk of rock with solar and fusion power systems and some arachnid synths to handle repairs...And might have a population of thousands or tens of thousands. A habitat for synths doesn't need an atmosphere at all, nor facilities for eating, bathing, sleeping, exercise...Nothing but the necessities for power generation, communications and entertainment. Then you've got your mined-out asteroid habitat. Might actually be quite a bit of living space but when it's almost entirely tunnels the width of the bore/processor synth that did the digging, it will seem like quite close quarters to a person used to Mars or Luna, and transportation to get anywhere will not only be 'on foot', but will likely be crowded and constantly feeling the intrusion of walking through other peoples' living space. So what I'm trying to say is, habitat size and mobility is going to change a great deal dependent on how crowded it is and how large the population is and even what kind of a population it is. I don't see much call for air vehicles in most habitats. They would represent too much of a risk in a spinning O'Neill cylinder. If you want to strap on wings and risk your neck, that's one thing, but anything with any real mass fluttering around near the axis and losing power/control could make a mess out of someone's structure on the rim. Bearing in mind that power is not much of a limiter in a post-scarcity environment, you're welcome to have monorails/elevators/slidewalks what have you for 'mid-sized' habs. Small ones will surely be 'walk where you need to go', but I imagine that few will really be so large as to require transportation except for shifting heavy cargoes around. I can't think of Scum clumps/flotillas without my mind drifting back to Alfie Bester's delightful opening set for his anti-hero Gulliver Foyle, who is certainly an early transhuman Scum who by the end of the book has gone large and in charge: "He lived in the only airtight room left intact in the wreck, a tool locker off the main-deck corridor. The locker was four feet wide, four feet deep, and nine feet high. It was the size of a giant's coffin. Six hundred years before, it had been judged the most exquisite Oriental torture to imprison a man in a cage that size for a few weeks. Yet Foyle had existed in this lightless coffin for five months, twenty days, and four hours." - The Stars My Destination If you've never read Bester's work, I highly commend it. He's one of the sources from which an amazing number of modern concepts spring. You could drop Foyle, character and mentality-wise, right into EP without having to do much besides dust him off.