Right. And what about the actual knowledge (skills) of the architectural work? In what ways could these be distributed?
Most of these skills were pretty basic to civilisations everywhere. Since the legions had a policy of recruiting tradesmen and had official patterns to worjk to, you would expect work of a fairly uniform nature. Having said that, the level of craftsmanship involved in Roman architecture depends on how long the settlement or fort is located there.
I see. Though what about the "chief architect", the individual in charge of the construction site, were did he come from? Would he have been a member of a engineering unit, picked from a certain class, education and training etc?