It sounds fun, but sort of randomly tweaking the settings more toward your SP experience has completely unforseen results, for most anyway. Which means that people who are a little more advanced will see things coming that others won't, and I really don't like to have an advantage. But I guess I can live with it, lol. Anyway it seems like you've put at least a bit o' thought into it.
Be advised that that map is ENORMOUS for twelve players, as well. Really the simpler thing would be to go for the medium random, but it's your show, your call!
And every completed MP game goes toward the Hall of Honors.
Looking forward to the game! I've only had one SP game with Mictlan, but I did like them. I'm dreading the micromanagement with a large map like this, though. Turns are going to be taking hours by the third year.