This is a belated entry with some photos of what has been going on.
You can see the completed Oak Frame here.
The SIP (structurally Insulated Panels) are going on.
The rear part is complete and the steel rafter panels are all in place. Note that the rafter panels and the SIPs at the gable end are at the same height.
The decision to use the rafter panels through was the right one as it made making the ridge detail and the level of the roof just work. Brian had a fair bit of ‘leveling’ to do as the Oak is not an exact construction method, but the result is very good and will not distort over time.
Would I use SIPs again – no. There are simply too many thermal bridges in this construction method to make it a good solution IMNSHO 🙂