An NPC character located at most large starports. When you have purchased a ship chassis schematic, you must talk to the Chassis Dealer in order to exchange it for the appropriate ship deed. This transaction costs a certain fee, depending on the level of the ship.
Chassis Dealers can also buy off space component loot from space. They will not buy player-crafted ship components. They will offer 1000 credits per level of item. Currently it is bugged so that level 10 components only give 500 credits.