Here are my Stirling models, from my first engine, to the last Stirling I have built.  After that It was a few Steam Models (another Page), and then on to IC engines (another page)
This little Stirling Cycle Engine was my first ever engine.  Made on a Grizzly 3-in-one.  The Grizzly was my first metalworking machine, and the first (and only) one that I have sold.  I purchased the video offered by Village Press, produced by Rudy Kouhoupt.  An excellent video and set of plans.  I learned a great deal of machining tips from them.
The engine still runs, I take it out occasionaly to "remember"
My second engine, another Stirling, from plans in the Village Press book "Projects One".  Although it runs, I never did get it one to run well, I found the timing to be very touchy.  (probably due to some error on my part)
My third Stirling, using plans from Jerry Howell.  This is my best running Stirling, apply a little heat and it runs and runs.  The smallest of my Stirling engines, it presented some challenges, but was worth it for the experience  and techniques learned.
A Stirling Pumping Engine.  Built from Castings and Plans that I purchased at NAMES 2000. 
Haven't been back to NAMES since, but hopefully next year.  Really a neat engine to watch run, with all the action.  This was my last Stirling model, then it was on to Steam models.