Here is a few quick shots of me trying to work out a good base size for my AWI project. The rules I will be using are the Bonnie Blue Flag rules for the ACW but obviously with a few range tweaks etc.
It's a toss up between having three to a base or four and still using my bases cut for my ACW collection which are 30x45mm. So basically, three with a 45mm frontage or four figs with a 30mm frontage. Both have their strengths... however, I know that the author of the rules mounts his four to a base and numbers are always good so I will probably go with the four to a base. In BBF it is recommended that units are six bases strong for a regiment. This works out well for the Continentals with the Brits having seven bases with the Grenadiers included.
I will be using 'Loyalists and Patriots' rules for the regiment strengths as this is a great place to start for unit composition for new comers.
The smaller 30mm frontage will help with getting more units on the board with the extra bonus of a slightly higher head count too. One of the things I like about BBF is it's use of skirmishers that can screen units and are an active part of the regiment. For my AWI collection I plan to have a base of three' light' figures but also three loose, single mounted figures that can skirmish. I love the look of this. Having a solid base of light bobs also means I can put light bases together to form converged units.