The other thing is, these models are not the sort of thing you buy out of a shop. The majority of them are handmade, and some take years to complete. The one model that was about 30% completed had already taken over 7 years to get there. And, once completed, you still need to get that boiler certified. No wonder the hobby seems to be dominated by older males. Youngsters come into it by inheriting their father or grandfather’s locos, they don’t sit down and make their own, unless they have a very highly developed machine shop and engineering bent.