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The vertical teak blocks holding the ceiling boards are screwed into the top cap of the hull. Whaler installed wood backing in the mold for that purpose. They are purely decorative, for a finished look inside the boat.

The ceiling boards can come out as a set by unscrewing the blocks, but it might be easier to pry them apart in place, since the bow rail stantions can make set removal difficult. A pry tool and claw hammer should do the trick, but you will have some unavoidable damage, hence the need for peg plugs.

Replacing them in teak would be a nice upgrade. Have your shop do what Whaler did. Start with 4/4 (7/8" thick) teak boards of the correct width, and then run through a table saw to make two 3/8" boards. If the saw uses a blade thicker than 1/8", you will have to start with 5/4 boards. I would expect a teak cost around $300.