Hi Charlie,
Thanks for your comments. In fact, I was not sure where to post… Indeed, I will re-post at the Medieval board.
Yes, the horses are converted. The whole reason for buying the ACW set was the horses

. Now, the head is a pretty good and easy fit once you cut the base of the horse neck flush and glue it to the Perry horse body.
But I decided to recycle the riders, too. Mostly redoing the riding boots with needle files and X-Acto knife – defining stirrups and spurs and adding some GS. More GS for chainmail and sleeves. For a couple of the riders I used torsos from the HYW set. And, obviously, Perry heads, leftower hands with spears and gear from Perry’s Light Cavalry.
By the way, many my conversions were prompted by your excellent minis!