Great idea. I think my whole steam collection is now about half "little engines" and half of those are of the Stirling type. I am fascinated by miniaturization. Though I have tried to keep my engine collection under 30 total, a few of these little buggers have crept in of late. Just got the same tiny Stirling Gil showcased a few weeks ago. It is indeed tiny, but goes like the wind.
As you have already realized...tiny/small fits a whole lot more spaces than bigger stuff. Look forward to seeing more of your buys.
Rog