>so basicly, for a queen "bank" you don't really need a hive, or is it more quality related, to keepeeing queens in a strong hive, rather changing those few attendats?
Any queen bank requires a certain amount of maintenance. With a free flying one (a five frame nuc with a frame of queen cages) you have to periodically add a frame of brood to keep them from turning into laying workers, dwindling or otherwise losing morale. You have to watch them as they sometimes make a queen from the frame of open brood. If you let the new queen stay too long they will eventually kill some of the queens.
If you have a queen bank in a battery box that is confined, you'll have to change workers periodically and have some source for water and food, where the free flying one will take care of that themselves.