Ah funny...never thought that was for a boat!:)
I had believed that will be for engrave something with letters!
So i will start for build an inversed boat's hull for have any form of engraving! :)

A boat floor deck is totally other thing!
I am not sure that the deck is longitudinally curvated!
It's generally flat! Flat inclined or domed laterally for evacuate water! ;)

Watching teak deck maintenance, repair and replacement is interesting.
The narrow teak planks are spaced with deliberate gaps. The gaps are filled with various materials, to prevent leaks. Oakum/pitch historically, with screws and bungs. Special caulk has been used. More recently, 9mm teak veneer, epoxy bonded, no screws nor bungs, with black epoxy filling the gaps. Steam bending.
- Brian