I was contacted by a company called Shapeways. They provide an interesting model-making service where it appears you send them a design, and they print it out as a 3D model and send it to you.
For example, here’s an N scale railway station one of their customers made.
They use several different kinds of material.
Just thought you might want to check them out. 🙂
DISCLAIMER: I have no relationship with this company, other than the unsolicited email they sent me.