Wow. This looks really good. I applaud you on the use of redbrown. The trebuchet looks quite acurate. I'm not sure if it would have those diagonal beams sticking out of the sides AND wheels, but it looks alright. And yeah, the Durmstrang faction is a great faction for siege weapons!
NIcely done! As Lord_Of_The_Lego said: "I applaud you on the use of redbrown." It looks prety massive. The diagonal beans at the sides are realistic, but not always easilly to make, as I experienced my self. The only thing I have to say is about the wheels. I dont like them on your trebuchet becouse it looks to heavy and massive for them, and it makes it less realistic. Wheels are more for a catapult or a balista.
Good work,