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What size gas tank do you have? I recommend you measure the tank and the space available under the seat. That should give you an idea of that part of the project. If the space remaining under the seat after moving the gas tank is too small for the battery, consider mounting the battery under the console.
Best location for the tank is under the forward seat.
You may need to move the seat board to sit on top of the cleats to provide enough clearance. This is a common mod by owners who installed the Moeller 12 gallon tank.