Big,
Can't remember the size of tank, had it custom made to fit between stringers. It starts at the back side of the CC and goes up to the casting platform. Pushed as much weight forward as possible for the larger motor.
For the deck, added 3/4 material to the top of the stringers as shown and for the deck used the same material as the bulkheads (composite). The floor is about an inch and a half higher then original. You can see the thickness of the composite in the new location for the bait well.