Tim, good idea, I think that tail needs a little more strength. People will be grabbing them there all the time and a piece of plywood might be the thing. Or even a 3/4" board, tapered to the edges like a mink stretcher. OH! Old wire muskrat stretchers would be awesome for a tail wire!
Chuck, I think the last time a made a bunch of these, I sealed the seam to the bottom board with carpet glue or something, and the tail and breast seams got a shot of gorrila glue. I also seal the wood with four coats before I put the canvas on, just in case it springs a leak. I've attached heads a couple of different ways, and on these swans I wanted the heads to be removeable, so I used a steel rod. The two geese in this bunch will have fixed heads. Let me post some pictures..
Mike