Ho will the Estates interact with already existing systems:
Will advanced governments (namely Absolute Monarchy/Enlightened Despotism) curb the power of the estates, considering that they were highly centralized governments than the basically feudal systems in place in 1445?
Will a powerful Burgeoisie increase the ticks for the Revolution disaster? Because that's what happened in 1789.
Will Prussia have Junkers?
Will the Estates be available for Republice government types? One problem I have with most non-revolutionary Republics (especially the Merchant Republic) in the game is that they can blob into rural areas were there should be a rather strong nobility without suffering any penalties.