Okay testing sizes of bases, in the blue uniforms, arrayed in 4 x 1 1" x 1" bases with 4 figures to a base. with a seperate commander base on a 2p, will probably be made to a 1" x 1" base as well if I go this route.
In the greys on the right, arrayed in a 3 x 2 40mm x 20mm bases with 3 figures to a base. Commander integrated for blackpowder, can be seperate for Warmaster variant (Still to be tested)
I'm not sure I like the one on the right so much, I can't get 4 wide on that size base, and 2 deep doesn't quite fit either, however it will leave enough space along the back of the base to put unit details on if I want to go down that route.
The ones on the left, looks a lot tighter and more regimented, but not sure how I want it all to look. Loose or tight ranks. The ACW wasn't as tightly regimented as say the Napoleonic era where the left one would be a no brainer for the look of it, but at the same time, does the one on the right look too loose.