I did hear they would add a cargo door to the left. My idea was to have a sealed battery
box in the storage area, with the slide out within the sealed box. The door would have venting to release any gases. I have seen similair ideas on pop up campers. Hallmark RV does this with their campers.
For the hot water tank I was thinking The Precision RV-550 NSP Tankless water heater which takes up about the same space as the standard electric heater that comes with the Lil Snoozy
and weighs less. It also vents through the floor for combustion and exhaust, so no need for a cut out for that.
I must say this forum is a very helpful one. I have been viewing it for quite awhile and there are a lot of good ideas shared.