I find it hard to wrap my mind around it!!! Those guys (meaning all the far northern hemisphere builders are tough boatbuilders.
Before the keel is added there is a metre of snow each side.
After the keel and seats are added there is still a metre of snow.
Perttu supplied me with some feedback that the duct tape is not quite strong enough in cold weather to hold the front of the boat together, though it is OK along the sides. So I have modified the plans with a simple improvement.