FarShot should want this to be a true mobile starbase, but I, of course, have no influence on what he wants at all.
That said, it should be more like a carrier than a flagship. The Avalon, after all, could probably handle most command tasks, and I can't imagine a government with a Federation socialist-capitalist economy, which does have its limits, spending what amounts of trillions of dollars over budget to produce something like the Camelot on a massive scale.
Camelot, therefore, not only has to be unique, but it has to be HUGE. It has to have the ability to support several frigates in its ventral docking airlocks, for example, and it also has to have much of the firepower of the Excalibur, but none of the maneuverability.