Heroes of Might & Magic III: Horn of the Abyss

I have an idea to create a unique mechanical device for each castle:
Haven: A ballista similar to a "stationary bow".
Tower: Something resembling an onager, throwing mines.
Rampart: A battering ram with a log in the middle (all in the style of Elves).
Inferno: A ballista firing flaming arrows (like lava snipers).
Necropolis: A ballista firing a cloud of death (like a lich).
Dungeon: Something like a small tower that fires a beam of death (like eyes).
Stronghold: An onager (of course, a massive one).
Swamp: A catapult firing nests with flying snakes; after falling, those with 50 health or less die, and two flying snakes appear, the number of which equals the hero's knowledge.
I'm sorry, but I don't know about the new towns, so I can't talk about the machines that will be in them.
Please consider my ideas so that Heroes can become even better...