As it currently stands Istarian banks are not only huge but a horrible waste of valuable real estate what i propose is this use a t1/t2 connie like structure , make it with, lets say expert mats and use one of the gnomian bots as its teller(it would be an Imperial teller machine)( itm)
to limit the impact on the servers the structure could only be placed on rci plot above a specified plot size. then we could recover the valuable land and add other important structures we desire to our plots.