I’ve thought for a while now about adding a mountain (and tunnel) to my layout. The problem is, this is Germany (or Ruritania, or Graustark) in the 1930s, so a southwestern U.S.-style mountain won’t do. I need an alp.

My current idea is to make a frame of rebar, cover it with wire mesh, and then use concrete-impregnated burlap to cover it in a sort of concrete version of paper mache.