I do have a bit of news that I'll post. I have managed to yank the engine off the old push mower that I have so that when I get scale model engine built, I can hook it up to the mower and use that as a test bed to try and work out as many of the kinks I can before converting a car. Here's a pic of the mower sans engine.
And here's a shot of the engine:
The mower and engine are currently sitting in my storage shed. I'm not going to hazard any guesses as to when I'll get the engine and boiler built for it at the moment. That'll have to wait until after I get my shoulder looked at and figure what I have to do with that.