Over on HMEM, there was a period of time where everyone seemed to be making them. I was among the crowd, and it will run on lung power quite well.
It's one of Elmer's engines, and plans may be found on:
http://www.john-tom.com/html/SteamPlans3.html
Fairly simple to make, but there are many ways to customize it.
Edit: link fixed
It's one of Elmer's engines, and plans may be found on:
http://www.john-tom.com/html/SteamPlans3.html
Fairly simple to make, but there are many ways to customize it.
Edit: link fixed