Hi Bill, As far as I know there are 3 of us building one, 2 of them in Canada. There must be more.?
I found a slight drawing error which might assist.
**LINK**
Hobbynut has got on really well and is waiting for latest edition to carry on.
Do a search on here you'll find some more info and photos.
The fabricated cylinder drawings do take a bit of 'getting' but keep looking,it'l come.
I'm doing solid cylinders carved out of cast iron,.. because I was given it.
Lovely engine,quite simple up to now, so have a go.
John