Stirling engines are a remarkable toy but they don't make near enough power (at any size) to be economically satisfactory for any real world application.

absolutely ingenious!

Not efficient as power producers, but they produce a smile factor that is off the charts.

There's a guy down here in Florida who might disagree with you there, Bill. I believe he's in Palm Beach; anyhow he's got a pretty good youtube vid of a Sterling he's built that puts out over 100hp.