There is a look at the figures on the Warlord games facebook page (
https://www.facebook.com/WargamesIllustrated/ ) showing the figure together with Kallistra figures.
There appear to be very slightly bigger then those. As I subscribe to wargames illustrated and this months cover "gift" is a sprue of the figures I have used my monthly£5 voucher for some as the ones available to member have already gone. I couldn't find anything else there I wanted so have ordered 2 copies of the magazine for 2 sprues for £9 in total including the postage. That's a dammed sight cheaper than the ones appearing on EBAY at the moment. They seem to be going for that price each.
As I dont have ACW in anything apart from some very old 6mm stuff I may just see how they compare, sizewise" with PP stuff. If its too far out I may do one side in just that together with some Kallistra (6 pack for the cost of 5) and see how it goes. Will still have to get CWB rules though. Can't be robbing Martin's retirement fund too much.
Still have 2 WW1 armies to get done first though. Thats going to be a big job before I start another one.
Derek