Hi there Paul
I have just had a good read of your thread and I really admire your build/what you are taking on.
One thing that is going on in my head, and I cant get around it, are you going to fix the bilge keels to the frames first and then plank, so therefore you will be planking up to the bilge keels? Or, are you going to plank & seal the hull first (with whatever method you like to use) and then fit the bilge keels?
Cos, fitting the bilge keels first I can foresee a few problems occurring whilst trying to seal the planking around the bilge keels unless you have a method in your mind, which you haven't disclosed as yet.
aye
John