The generic Freelancer ID says that "Cannot use Cruisers, Battleships, or ships with more than 3600 cargo space, except l'Anne and the Pirate Train". From what I saw, Bustard is a Liner Class and have 1800 cargo space. It is not clear to me whether or not I am allowed to use it with Freelancer ID, but I need him for RP of my characters.
To be more clear, you can drive it freely by server rules, but some hauses offical factions may whine abaut it, and make a fuss, claiming you brought foregin warship in to their teritory and that your Bustard is more dangerous that fleet of pirates yadda ,yadda, i had such expirience in Rheinland, but not in Liberty and Bretonia , i guess they are more liberal.
Actually every house space forbids, unless registered, except for Liberty, but... it is possible to promise being registering every time you meet them
I was given this awesome advice from another bustard colleague, not sure who was it exactly.