Anyone ever replace the primary cowl vent (the one ahead of the mast) with a solar fan / other ventilation device? Living aboard and cooking with an alcohol stove has put me in multiple situations where we've set off the CO detector, and clearly we need to consider better ventilation. The farther we get into fall/winter the less I'm going to want to (or be able to) open the hatches, though some clever rigging of tarps may assist (and nothing says "liveaboard" like tarps bungied all over the deck.)