Tomorrow I'm going to close both my emergency hatches in the roof with 16 gauge patches I've prepared. I do want a vent fan in at least one of them. But right now fans are low priority and funds are needed more in other areas.
However, I have some jigsaw blades that do a very nice job of cutting that 16 gauge if it's well lubricated, so next year I intend to cut a hole in at least one of my patches and put a fan in there. I really want 2 reversible fans, but I also want solar panels on the roof and a small deck.
So I will probably cut a new hole for the second fan, and build my own wooden hatch where the other emerg hatch was, with a ladder I can take down and put somewhere out of the way. At least that's what I'm thinking now. I will make up my mind next spring.