CAT.org.....
the Centre for Alternative Technology, Macchynlleth, North Wales........they run grean oak framing courses.
Having said that, if you are working to drawings they should have all the information you need.......if you are any sort of woodworker then the skills are dead easy. Green oak is just lovely to work......it really is like cheddar cheese. I reckon that you might be better off just giving it a go if your woodworking skills are already OK.
Mike