Progress had stopped on this due to a couple other more pressing jobs, plus I was still dithering over how best to make the required toolholders for the turret.
However I've added to the Denford collection in the form of a Novamill, and the first toolholder has had the underside machined. The critical size came out perfect being a nice tight fit in the turret, so I just need to drill & counterbore the mounting holes, face the sides, then get it drilled & bored to size. Oh, and make several more.