Good idea, but I siggest you get a base game you're happy with, and then start adding features
You don't want to end up with a bug-ridden game, because you added too many things at the same time and making it difficult to hunt bugs down (RTR VII's script inconsistencies come to mind, they haven't been able to solve various reforms not triggering after months of it being released). But it's all up to you, I'm just over-cautious