I have been tidying up my hex based ACW rules and have put up a blog post that is just a gentle discussion on some design aspects.
LINK
https://battlefieldswarriors.blogspot.co.uk/2017/09/acw-rules-design-tfon.html
Enjoyed my read-through of your post. Like the device of multi-dice roll giving casualties to either side depending on low or high value. Also having a "bank" of dice for certain units that can be expended in a re-roll is a clever idea, plus it helps you remember that you have a re-roll opportunity, something I sometimes forget.
Kind of wish I did ACW.
A bit like this Brit who hasn't had an ECW game for a couple of years or so.
An interesting read and some interesting mechanisms :)