I'm in the process of building in 10mm also. Still have not decided upon basing and number of figs per base.
Originally I was thinking of 40mm square for all troop types,
8 muskets per base in two ranks of 4
12 pike per base in three ranks of 4
Trotters 2-3 per base
Gallopers 4 per base
1 gun plus crew per base
Then I was thinking of doing Pike and Artilley on 40s and Shotte on 40x20s and Trotters on 40x60 in two ranks of 2 and Gallopers on 60x40 in one rank of 6.
Then I was thinking of 30 squares for everybody.
Still dont know, I need to just get all the different base sizes in front of me and place minis in different arrangements.
However, my current time is preoccupied with painting more 28s for my ECW armies