I don't know offhand what the breakdown is, but all totaled my Gato weighs in right around 9 pounds, ready to run. The sealed cylinders of the pressure hull total about 23 inches long by 2.5 inches diameter, supplemented with around 45 cu. inches of foam flotation, all of which resides just below the surfaced waterline. I'm not sure what the lead comes to and I would have to dismantle the boat to find out, but it has to be several pounds. Revel Gato's are tricky to get into stable trim on the surface. For all their size, the narrow tapering hull puts space for tweaking lead and foam at a premium. But then again I've read that the 1:1 boats were pretty squirrely in a beam sea and would roll heavily.
George "Crazy Ivan" Protchenko
“There are the assassins, the dealers in death; I am the Avenger!”-Nemo
"I'm disinclined to acquiesce to your request; means No!"-Capt.Barbossa