I have done some quests for that woman in the Dawnguard who wants you to find crossbow schematics, and so far she has given me enhanced Steel crossbows, Dwarven crossbows and enhanced Dwarven crossbows.
I expect that there will be more types, but for now she won't give me more quests.
Can somebody please tell me how many different types of crossbows than you can unlock? How do I unlock those quests (if there even are more)?
I guess that makes sense though, but still, it would be pretty awesome to craft a dragonbone crossbow. Maybe we could have quest in the future where you must gather a special daedric and or dragonbone crossbow artifact to the Dawnguard so that they can duplicate it?