If you get back to this at some point, there are a couple new critical buildings that would be better to have placed in all cities, ancient custsoms and imperial fortress for instance, and some more unit variety other than infantry right at the start might spice things up for some early war action. Also, where are all the nukes?
All things aside though, I love the idea of a future era start scenario, only bothering thing is the culture overlap at the start. You do have to go through a lot of pop ups on load up and then again on the first turn, from natural wonders pop ups to resource acquired ones, but it's manageable, only took me a few minutes to get rolling.