Re: battery/gas tank
I had a Hurricane 240 Midships and the battery and gas tank that shared the same compartment. Granted, it was a very large compartment (about 3 feet high, 8 feet wide, and 4 or 5 feet long) as it was made for an I/O option and I had the OB option.
That being said, that installation seems to be so stupid. On the pontoons that I have recently seen (boat shopping), the battery is either exposed under the sun pad or in a different compartment or area. One had the battery located under a shelf in the flip up "changing room".
So I would think that you should move it, perhaps to the other side?