Almost forgot those narrow gauge kits using laser cut wood. Seem to remember something went wrong with supplier. Fancied one at the time, but they disappeared hen I searched for them again.
As for kits/models lying around unmade/unused, well I tend to buy some kits when I see them, partly because they are the right price(not to be repeated) or they are not around when I actually need them for a project.
That is one reason why no reports on 3D printed Gn15 models out there. Another reason is that not everyone either wants to or is able to publicise the models they have built.
I think there is a thread on another forum concerning 3D printing and Shapeways. I got the impression(difficult when reading a foreign language sometimes) that there are a few out there who just don't like 3D printed models and won't give it a chance.
The kits I buy tend to be plastic, as resin ones cost a lot more, and don't always come out as intended. I like to adapt models, and that is also more difficult with resin.
Good point about over-used moulds , that is the problem. It might be relatively easy for the original designer to make new moulds, repair master, etc, but when that person , for what ever reason, retires, it is very likely no-one else will take over.
I think this thread has put me off designing anything for Gn15. Most of my designs are of real prototypes. This means I don't have to think so much

, and there is quite a good chance someone out there is looking for a model of that prototype. I am also wanting a particular model for a project I am working on, hence my WW1 60cm gauge items.