I'm still working out the specifics but I started painting up a small NWMP force this weekend. I finished 9 men on horses. Not great sculpts (Airfix quality) but the price was right (less than a penny a piece) and they paint up well enough to play with. I also have cannon and foot being based right now.
I'm thinking about using a hex grid (yes, how surprising...) and DBA command mechanics (a la For Honour and Glory) to give a basic structure that can handle battles of different sizes (right now I have some good maps of Batoche). I've scoped out Indian and Metis figures as well as the US Cavalry (think Inspector Steele vs General Custer).
Up next: A bunch of Canadians for a Very British Civil War are just about dry along with some more 1/72 figures. After that some more superhero buildings, I think. And Bruce wants to try Square Bashing tomorrow night so maybe some game shots.