This will only function on shipyard-type docks. Or, at least, docks that have a bar and central room.
They must also have spacelaunch, commodity, and equipment all in 'deck' for the template to function.

Base file:
[Room]
nickname = ShipDealer
file = Universe\Systems\SpecialRooms\largeship_shipdealer.ini

Base rooms, under hotspot_equipdealer:
[Hotspot]
name = IDS_HOTSPOT_SHIPDEALER_ROOM
behavior = ExitDoor
room_switch = ShipDealer