Congratulations, that was a very good game.
I wonder how it would go as a 5.2 game from the beginning. I found myself with 0 BB for a decade at a time, due to having as bad a situation as -22K manpower in the early period of the game.
Looking forward to your end-of-game report.
The only difference is that you can't fight nomads too early, or you will drain yourself out of MP. And you mustn't take any attrition. And also, building MP buildings should be a good idea.