My timber pack provided more than enough Douglas Fir boards to make the cabin roof cleats. I managed to make all five cleats from just two boards, so I have spare stock for other parts.
I made the cleats 1 1/4" deep, allowing for enough to be planed off when levelling for the installation of the cabin roof.
I will apply a 3/8" round over before fitting, but for now here are the two cleats either side of the companionway on the rear cabin wall.
And here are the three cleats between carlins on the forward face of the cabin, on bulkhead 2.