Jumping in with Both Feet on a 20 Seafari

[SailorChlud]

Very interesting. My coffin has a 48 inch deck under it, not 60 inches. I wonder if having 12 inches of tank length unsupported would be a problem?

I have about 8 1/2 inch of depth to work with in the coffin, and a tank height of 7 3/4 is possible, because once the tank is under the lip of the lid, the under deck clearance rises to 9 1/4 inches.