I have three small hatches in my boat, one into each head and one over the galley. They are too small for anyone other than a very small child to get in. Leaving these open along with two Dorades keeps air circulating quite well.
Before we go off cruising I intend to make a stout stainless grid that fits into the wash-board slots so that we can leave that open too.
I find the biggest problem with leaving anything open on deck especially in the tropics is that it can rain torrents within a moments notice and if you're not on board . . . . . .
We met some people in San Diego with a magnificent Passport 47 who were in the islands and were at a pub ashore, left all their deck hatches open to combat the heat because they could see the boat from the restaurant. And then a deluge came and all they could do was sit and watch as their boat got drenched down below.
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"Two possibilities exist: Either we are alone in the Universe or we are not. Both are equally terrifying."
Arthur C. Clarke