I agree with Jason – most of the castings are more trouble than they're worth, better to use stock materials (or make your own castings, something I've just started with, for a future project mainly).
With your knowledge and equipment Django, I'm sure it wouldn't take you long to build a Minnie. The following pics are the state of play with mine as of today. I ordered the materials for the boiler almost exactly a year ago, so this is about a year's worth, by no means working on it every day. I bought laser cut spokes and strakes, but made the boiler and gears.
Edited By Andy Stopford on 09/05/2023 19:33:08