Stirling Engines

Hey How many of u are knowing about stirling engines?
Just google this term and we will think here how to make one.
So i will like you people , hope mostly indians here , to prescribe or
suggest parts for this stirling engine concept.
Exactly i wish to use this in making a toy or something like tht.
Before tht i would like to tell you tht this engine uses waste heat
ie temp difference between ur hand and air etc etc, so making use of waste heat can people here search for how to make and get the list of parts , which are especially available in scrap in india!
so we all will make models working ones!
some stirling engines work on solar energy too ,
so why not make one!