sorry there was a problem , but its just a standard link , so should always work.
Anyway, I am not really interested in doing any locos or wagons for Gn15. The size means they are not cheap, resin kits for wagons look cheaper, if available.
I am working on track items. Only pictures are those I either generate using CAD software or the Shapeways page.
Latest offering is a small wagon turntable, with different surrounding parts, ie small, big and giant stone surface.
Assuming the link works they are in the wagon turntable section.
Generated pictures here
The actual turntable is 48mm diameter, the surround are 67mm each side to fit setrack geometry. Plain topped turntable, plan to add wood type top as well.