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You have to think about storage and transport also. In the space that one can store 4dz floaters, you can probably store 40dz socks.
I've been down the "make your own decoys" road.
It never turns out like you imagine. You're going to end up with a half-assed decoy on a Jerry rigged stake. You're going to spend money on the decoys, the paint, the stakes, decoy bags, etcetera for something that will be less than stellar. If you cut off the keel, you no longer have a viable floater. If you cut out the entire bottom, I can almost guarantee that they will curl.
If you just want a cheap project, make silhouettes.
I'm not trying to rain on your idea, I'm trying to prevent you from throwing away time and money. I tried all sorts of things when I was younger, they just don't turn out that well.
If the decoys are that good of a deal, buy them and use them to hunt ducks. Even repaint them as ducks.
Buy a white hoodie, a decent call, and 25dz socks and you can shoot a few geese.