Bonjour Larry,
The Stuart D10 is my favorite steam machine, I have five of them and "only" three in 1,20m - 1,40 m boats (see my videos on "Côte d'Emeraude", "JAN" and "Ulysse Max").
My concern about your one is that it has no reverse, difficult to maneuver a boat without, except if you also have a variable pitch propeller.
As example Here is my smallest D10 equipped boat (Jan, 1,20 m, +/- 20 kg) :
As I silver braze my pipes, here is my method :
I hope this will help you.
I agree that the D10 is a great engine and was one of the first that I bought. As for reversing the boat I do have a second variable pitch propeller that I hope to use with this steam plant eventually.