New Battery Relocation & Configuration

[Amapola]

Looking for advice on a new battery conversion. I currently have 4 strings of 6 volt Golf Cart batteries mounted forward of 2 Lehman engines. The batteries do not have ventilation. They are charged by 280 amp alternator and 2 70 amp IOTA chargers (shore power generators). Because of the heat generated, the batteries only last a few years. I replaced the batteries 4 years ago.

I'm proposing 6 2 volt Rolls S2L16 batteries in a new location. I plan on building a containment box with forced positive & negative ventilation.
1) Do new batteries require a leak proof container and if so, How much liquid should it contain.
2) What physical restraints are required?
3) How close can the battery cables come to fuel tanks/fuel lines?

I want to do this properly in the event I have to obtain a survey for insurance purposes. Any advice will be appreciated.

[rbk]

Here's a good place to start:
https://marinehowto.com/