They float real nice. I've never had one turn over on me. I started making them out of 2X construction grade planks, and they worked fine. Lately I have been using 2" thick slabs left over from the 6"x8" timbers I use in making full thickness decoys. I've made buffies, whistlers, bluebills, redheads, cans and common merg flatties.
Its true they don't need a keel. They float right as is. At the moment I have 2 unpainted buffie flatties in the shop awaiting painting and an owner. These are the 2" cedar versions. They could be yours for $25 each or $45 for the pair plus shipping. Since they are unpainted, you could specify a drake and hen or 2 of a kind.
John Bourbon
PS, its kind of neat to see someone saved a picture of my work bench...