Do you imagine Steinar made decisions on his boat to have thicker sections of foam between the water and the interior? I wonder about his ww hull, but think it is mostly speed decisions.

Rob does solid glass for the radius of the corners. The foam tapers into and out of these radius as has been discussed That would be easy to foam fill post infusion, as has been discussed.
Steinar's lw hull is the older style rounded box with contiguous foam. Perhaps that's more appropriate for the cold?

How are Northern sailors/cuisers boats different?
How would you modify a HP for above the Arctic circle sailing?
Enclosed cabin with insulated doors seem to make sense.

The North has fresh breezes that even Rob could not tolerate for too long I imagine.