Added some insulation foam under the battery box since the hot water heater is out of the way. I feel that any insulation anywhere is a help along with sealing the air infiltration. Mt new hatches will help with that. The new construction is taking care of other air leaks as well, plus it being apart I have ideas how to plug up others before this is finished.

The silver flex duct goes to the waste tank compartment...I have removed some of the kinks and will be able to make it a bit shorter upon finishing the galley area and new hatch box that will back onto the stove area.