Hi Jay and others who replied, thanks. Maybe I wasnt as clear in my post, I got the impression that Jay thought I meant learning by building other peoples wofati by myself, what I was referring to is, its the kind of structure youd want to work as a helper on some other peoples ones first before building your own.
I also did have a question in my post "My concern and question is what do you do if the design isnt just quite right, can you add a rocket mass heater, etc"

, although yes my post is was also part statement, guess not putting in the question marks may have made it harder to see, basically my question restated is how easy is it to put in supplemental systems for heat, and/or retrofit one in if you discover after that you need one?
I think alot of people will do like in michaels post in that its probably wise to learn by building some outbuildings first and then do your main structure. The statement part of my original post is that im concerned that people will get all excited to get back to the land or whatever you want to call it, see wofati and if thats all they can afford as a house, build it, and its a great concept when it works right, I guess i can see alot of city raised "screenagers" as Geoff calls them building one and freezing or being wet all winter.