Herein lies a collection of my many weapon designs, feel free use them (block for block if you like) but just stick a sign on a subtle spot (or something) giving a tiny bit of credit. Catapult -mobile version Flame-Tossing Catapult
I like the looks of it but are you going to release more? And you should add wheels to them 8How the heck are they going to move them?) It need's more details tho. Anyways it's a nice siege weapon ;) /)
The idea is that these would perhaps be stationary inside of the walls, mind you most catapults built for siege were stationary so that they were out of harm's reach and were accurate once fired. I will however try to make some mobile versions.
I really like the mobile version xD I will someday use it I promise *I will give you credit don't worry ^^) /)