I have a friend who built a Greg Tatman boat. Nice looking boat. He put a 3/4 thk uhmw skid plate on the bottom which added quite a bit of weight. And he has had maintainence problems with the skid plate.
Somewhere on the web, I once found either uhmw or kevlar sheet in thicknesses of .060 to .090 to be glued on the bottom of drift boats. That makes more sense to me.
Things to check out when considering DB kits are specified length. Some are measured straight down the center line ,as you would suspect. Others are measured around the side. Like a 17 ft boat takes a 17 ft long piece of plywood to build it. But, in reality,, it may only be 15 ft down the c/l. The other thing that is important is the amount of rocker and the amount of freeboard. Being a rather specialized design in itself, there are no hard, fast rules for drift boats. And everyone will tell you theirs is the best for one reason or another.
You will probably have the only drift boat on the east coast. Enjoy.
I fish because the voices in my head tell me to