In the old I/O mine 1975, I have two 20 gal tanks above the floor under the gunnles.
Just have fish boxes in the floor. But I love them!!
I added a extra 25 gal tank were the old I/O use to be, and kept the engine cover for cut area and a good place to sit and jig.
This pic was from the do over, but you see the extra tank
I also have room to leave a small bait tank stored in there.
Here it is covered up
I don't have a pic of the tank, but there is one on each side. in this pic you can see the gas filler on the right and the tank is covered behind the seaboard.
