I don't build Tom's boats but I have built a lot of this style. I use WRC on all my stringers and I see no reason not to use it on yours.

As for stringer sizes on my multi-chine designs I started out with 1.5" x 3/4" gunwales and all the others stingers were 3/4 x 3/4. But I found that made the frame to flexible so altered my design(s). So I replaced one of the 3/4 square with a 1 x 3/4, near the turn of the bilge and that makes the frame much stiffer.

If you need any advice just email me. Always happy to help someone getting kids out on the water.

Jeff
Kudzucraft skin boats