I was back at this frame earlier today and got a closer look at the joint layout. I also tried to study some of the other joinery that was not as clear to me. I determined that it is not possible from this frame to judge the original roof framing, but I can make an educated guess based on other frames nearby that display the same window placement proportions etc. There are 3 common houses frames that are repeated many times in this area.
I specifically set out to look for clues on layout. What I was able to observe is that every joint I surveyed is housed, regardless of where it lies on the timber.
I took several more pictures. I'll upload those when I have access to a computer.