I'm the DM for this particular game, if anyone is interested in joining the game put a post here with a Character idea. Currently we have the following positions on the ship filled.
Explorator: The techpriest in charge of discerning technology and managing the maintenance of the ship itself.
Ork Freebooter: Taking the position of the Arch-Militant as master-at-arms. He's in charge of the Boarding parties and defending the ship from the same. He's also the medic, so don't get injured.
Rogue Trader: The Lord-Captain of The Tiamat, the ship that you'll be travelling on
Void Master: Master of weapons, he's the ships gunner essentially, he manages and maintains the ships weapons systems and is in charge of making hits during ship combat.
Current Open Positions
Missionary: Maintains crew morale and defends the crew's mind and souls against the predations of the warp, important since Warp travel is a necessity for Rogue Trader ships.
Navigator: Sanctioned mutant capable of seeing the tides of the Warp and navigating the Sea of Souls.
Astropath Transcendant; Powerful telepath and diviner, a psyker who can send and recieve message from across hundreds of galaxies.
Seneschal: Is the master of trade and commerce for the ship. Makes all the Acquisition rolls and deals with bartering and haggling. Generally the face of the ship in terms of acquiring resources. Suggested only for advanced players.