I've had that problem of waterline hulls warping just a little bit several times. The solution lies in fastening the finished model down to a display base of some sort. One could, I guess, simply glue the hull down, using weights or clamps to take out the warp. What I generally do, though, is make provisions to fasten the model to the base with screws or bolts - preferably the latter.
I usually start out by drilling a couple of holes, to fit the bolts, through the "waterline plate." Put the holes as close to the bow and the stern as you can; that gives the bolts the most leverage to take out the warp. Superglue a couple of nuts to the plate on top of the holes. Use plenty of adhesive; it's not a bad idea to build up some filler (e.g., baking soda) around the joints. (If the nuts come loose after the model's finished, you'll have a problem.) The bolts and nuts will hold the model to a temporary "work base," made from a conveniently-sized piece of wood. (I find that making the work base about 3/4" or 1" bigger than the ship on all sides is about right.) Winch the bolts down firmly with a screwdriver, and the warp should disappear. When the model's done and you've made the permanent display base, just transfer the locations of the holes to it.
Another approach is to glue a strip of wood (the harder the better) inside the hull, and hold it down with wood screws instead of nuts and bolts. That works fine, as long as you don't take the screws out and put them back too often.
There are some nice pictures of the Monterey at www.navsource.org. One of them shows her in the dazzle camouflage scheme (though the shadows cast by an apparently near-noon sun make it a little hard to decipher). There's also an interesting shot of an F6F sitting on a lowered elevator.
Hope that helps a little. Good luck.
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