I only ever painted one of these battalions. You can see how I usually plan my French armies. I either a) 4 bases all fusiliers and just assume the flank companies are detached b) 4 bases with 1 as grenadiers and skirmishes as separate detached figures.
I always like big stands no more than 4 per unit. Usually between 24 to 32 figures.
Offensive minutes paint up very quickly and I think they look good. The range is a little limited but good enough for the bulk of the line in the Peninsula.