Originally Posted by Dumbstruck
Would it be the same thickness as the deck
Maybe. Maybe not.
A boat is designed as a whole. It all works together. You cannot pull out a single
element as if it exists separate from the rest of the boat. How the foredeck is designed is going to depend on a hundred other variables involving all other aspects of the boat.
So, in a general sense, this is not a question that can be answered. If you are wondering about a specific boat, say so. Then you might be able to get some useful answers. Otherwise the only real answer to your questions is, "it depends."