Regiments of Foot
I decided on wings of 8 musketeers, which handily is a pack; a pike block of 12 pikemen (1 1/2 packs); command strip of 4 (1/2 pack), and a couple of halberdiers (1/4 pack). So a regiment was 4 1/4 packs or 34 individuals.
Basing - rather than base for a particular ruleset (not important if I am providing both armies) led to the following idea. Base figures on 15mm × 40mm. This would suit strips of 4 figures, with halberdiers based 1 per 15×40. A couple of blank bases would make everything neat and tidy for a 120mm × 60mm movement tray. This would also give the option of having the command strip at the front or at the back once the roughtie toughtie stuff starts.
Here's a couple of views of Colonel Charles Fairfax’s Regiment of Foot to illustrate my infantry organisation. Pretty pleased with how they have come out.