Baz, I won't say it has not crossed my mind. Both the book of the "series 24" engines though that may have to run into a second volume at the rate I make 'em. As well as producing the main "castings" as CNC machined parts maybe with some machining like drilling, boring and tapping left to the buyer in much the same way they would with a casting. Maybe the option for those parts completely machined as well. ARC did look into it a few years back when JS was about. Might start a new thread on that subject.
Emgee. Yes it would really want to be a demo of the machine actually producing a part that most visitors could relate to be it a bed plate for a stationary engine, spoked loco wheel or such like. While the machine could be watched getting on with the machining someone to show on a screen how the part was modelled and how the CAM was done would all add to the interest
Maybe we could have a competition with one demonstrator making 2D drawings, wood patterns and casting against the 3D model, CAM and CNC