Interesting, I thought necromancers would be people capable of controlling the dead (hence my mod of a necromancer, who raises an army of the dead)
Trebuchet would be awesome, but a proper petrobolus would be much better. A REAL Greek petrobolous was a stone thrower, but used a bulky balistae configuration. A properly scaled Helepolis would be cool, or one that could garison a reasonable amount of units. You could also do an assortment of historical techs, like some kind of gold purification that can yield finer gold from the same ore. I don't know, it's hard to come up with a original hostorical mod that doesn't require a new model.
Practice safe foruming by not posting tired.
On my todo list of mods (meaning stuff I really want to do but can't get around to yet):
Editor Modpack of some sort
Project Excelsior
Always keep in mind, all my posts are a stream of consciousness, so don't take anything I say too literally.