Rob,
Go to the "My Tube Guru's Webpage" and send Dennis an email. He and John Camille built a stereo 211 amp starting about 10 years ago and wrote about the design, problems and solutions in a series of articles that were published in Sound Practices magazine over a year and a quarter in 93/94.
Dennis has hard copies of the series and I bet he would send you one.
He also sells output transformers for 211s that a guy in England winds and he lams.
I have not heard any amps made with them but have spent many hours listening to the Ace amps at Dennis' old place, and had the Mullard 3.3 prototype amps in my system for at least 6 months. The transformers in those were wound there and lammed here. Those little Mullards were what got me into SE.
I do not have a clue as to the price of other specialty output transformers so I can't tell you if it is a good deal or not.
I have to go to his website to see what his prices are myself because I never buy anything from him, as we have a barter system going that lets us both do better than $$.