blistered hull? I used 1mm thick styrene sheet plastic to buildup the blistsrs on my 1/429 scale OBB project using Revell's Arizona as a base to build all the old battleships from the Wyoming class to the Colorado class during ww2. most of the blisters I made are hollow like on the real ships. https://forums.firecrown.com/uploads/finescale/original/3X/a/6/a66c1e72637ed1356c972824a5c151232560e4bb.jpeg
it appears only the forward part of the bilge keels would have to be moved onto the blisters whereas most of the bilge keels form the bottom of the blister. I have some drawings of the Savannah if you need.