Wasn't really thinking about the weight of the fuel, that is a very good point. Going to have to do some math and figure out how many gallons it holds.
I have another fuel tank in one of my donor boats that may work. It is mounted under the floor towards the front of a closed bow. Going to have to get it out and see how big it is.
Portable fuel tank is still an option, definitely keeps things simple if I go that route.
Where would be the ideal location for a fuel tank? Do you want to try to keep the weight of the boat centered, or would it be better to have it towards the rear?