Jim,
My research in historic framing is rooted in the Ohio area. Unfortunately that's quite a bit later than the time period you are studying.
I would recommend looking for "Framed Houses of Massachusets Bay" By Abbott Lowell Cummings. It may be in your local library. I will also forward your request to Jan Lewandoski who is very knowledgable in early colonial framing.
Good luck with your paper!
Rudy