This evening I tried another portable wargame, this time using the Ancients rules from the second book to try an ECW battle. Basically I ran the pike and shot as shooting heavy infantry, the horse as a form of heavy cavalry and dragoons as a kind of fast-moving light infantry. I kept changing rules as I played, forgot key things and generally made a dog's breakfast of the whole thing, but it's given me some food for thought and there should be a passable version of the Portable Wargame in there.
I used 3" squares on a 2' x 2' board, with four pike & shot, three horse a dragoon and an artillery unit on each side. Plus a commander each. To be honest for a trial game I probably made the terrain too complicated, and will try an open battlefield next time.
I took a couple of pictures, because a blog post isn't half as interesting without pictures.