Yes to all those questions.
Some members have experienced problems with foam in place tough with water getting under the foam and causing problems with the wood.
viewtopic.php?f=2&t=5607&p=39321&hilit=foam+floatation#p39321viewtopic.php?f=2&t=5508&hilit=foam+floatationThat said, I CHOSE to use my access hatches in the chambers to stow dock lines anchor lines etc....I'm sure it cuts down on the floatation,but it was my choice
You can also stuff the chambers through the hatches with empty plastic bottles
If you don't open the chambers when not using, they will collect condensation