Paula,
Absolutely beautiful work. I can certainly see the family resemblance between your engine, and the one that Nick picked up, in that the valve chest is held on by 4 studs in the corners, although Nicks is much larger (I am guessing 2" bore like Mine). Mine is of course different because the cylinder and valve chest is fabricated rather than cast.
I wonder if the larger ones such as Nicks or mine are pictured anywhere in the catalogs or literature.
Jim