They're great rules and made for a good game, albeit my slow taking up on the mechanics (all part of the process).
I was inspired enough to undercoat Hanoverian and French units yesterday so the rules have triggered the impetus I much needed to get those damn 28's painted!
The rules could be crudely adapted for ACW by adding smooth bore musket and different artillery ratings, plus maybe special bonus attack dice for rebel yell charges and elite units such as zoauves and iron brigade?? I suppose some of the formations will not be relevant but a simple rule addendum would suffice instead of re-writing another set?
I would be happy to have a go with them if you feel inclined to draft a set.
I will aim to do a Bat Rep post once I have enough units painted and based to do the rules justice for the Naps, but that could take a year!