Mostly a style thing, it seems. I'm in the teak 4-piece camp myself. It's a traditional look and for me there's something pleasantly liturgical about removing and storing them, along with the other things we do to bring the boat alive when we get to her. In cool or drizzly weather we also frequently leave out the top board.
Still, it would be nice to have some additional light, and a view aft when things are buttoned up in really snotty weather. I'm thinking about making one replacement board with an acrylic window.
This was an easy project and really lightens up the cabin. I used a piece of 1/2 inch smoked polycarbonate with AR rating (abrasion resistant). I finish cut the piece on the table saw and rounded the edges with the router table. The sliding hatch cover had to be removed and re-bedded and...
ericsonyachts.org
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https://ericsonyachts.org/ie/threads/whats-the-most-useful-modification-youve-made.3857/post-26058
Christopher, yours look great.