If your boat is of steel construction and not traditional build the extra heat you generate within your nearly air tight pod will feed through to the hull and head immediately to the coldest area's ie. the uninsulated area of the boat. The stern where your engine bay and fuel tanks are. You will always get moisture inside metal fuel tanks, hence why new builds use polymer tanks.
If the boat is of traditional timber construction this allows your hull to breath, and the build up of heat dissipates differently.