Fuel tank worries???

[hooterville]

Any 18' Tracker Grizzley all welded owner's here? what are you guys doing for fuel tank(s). Compartment looks small for a tank and 2 or 3 batteries. Been shopping around and that is one thing that is holding me back from buying one is the small area for fuel tank and batteries. I'd like at least a 12 gallon permanet tank for at least a 60hp 4 stroke.