Whew! Looks as if I'm on the right track. Thank you all for replying. The stirrups will be added. :)

I was intending to make sure it fitted the standard P4 horse, yes. I'll check it with the Ultimate Horse breed morph sets as well. I shouldn't look out for it any time soon, though, there's a lot of work still to do!

Freyfaxi, I've been looking at the horse stuff they put together for Lord of the Rings, thinking to do some 'inspired by' stuff for Poser. I've started with a tack/morph/mane/tail set based on Arwen's horse- not an exact copy, but something with a similar feel. If I ever get on to the Riders of Rohan, they'd probably be okay for Dark Ages with a fantasy twist.