It's wonderful to see so many great bbooks and plans on Sterling Engines. Likewise there is a huge range of working Sterling Engine models around these days. Some of the nicest I've come across are those sold by Hammacher Schlemmer. Take for example the beautiful external combustion kraftwagen model I posted about last year. I don't know who exactly is producing these beautiful metal models for them, but they state that they are made in Germany.
This fully operational model is machine-tooled from solid brass, stainless steel, and aluminum. Power is supplied by the amazing Stirling Engine which uses the expansion and compression of air to turn the engine. An alcohol burner in the rear fuels the engine. These engines are remarkably efficient: full burner of ethyl alcohol allows the engine to operate for up to 15 minutes. Not keen on the idea of running an engine indoors. No worries: the exhaust is just steam and heat!
Here is where you can get the Mercedes model powered by a Stirling engine