oh OH AAH.... now im all beside myself

as a swede the this time period i just love

If new units are made, dont forget swedish light cannon that can move. This was one of the reasons Sweden was so succesfull. And swedish/finnish cavalry... the finnish Hakapelitas are really cool. just the name alone makes you feel good.
But one thing that will be hard to mod in is that during this period mercenarys became more and more important
And a new religion needs to be put in; Protestantism

I really look forward to such a mod

(i might be able to help you to dig up things about sweden during this period)