Bonjour Charlie (I definitely don't like nicknames),
The D10 is the machine which gave me the steam virus more 50 years ago and is THE best representation of a model steam machine to my opinion.
Based on my experience, its major problem is the rust, especially when using original metal piston O'rings, this is why mine have a little screw on the cylinder head to let me put some oil after each navigation.
How do you protect your one from rust ?
I mainly run it on air. When I do, I squirt oil into the end of the air hose and let the pressure drive it through the cylinder.
I have only run it on Steam a few times and I always have run it on air after steaming to dry it out. Mine has an oiler on it when running on steam.