Thanks for the nice comments about the decoy, let me give a little background about my self, I live in Michigan and have been carving for about 6 years mostly IWCA style birds and have been privileged enough to learn and carve with a bunch of good carvers and most importantly great guys.
Dennis - I get my balsa from National balsa, phone # is 1-413-277-9500, I order it by 4 1/2" X 7 1/2" X 4' and ask them to use water proof glue, great company to work with.
Steve - No bottom board or tail board, and yes I use both the grinder and a knife but mostly knife work, and then to answer the sealing question I put on a product made by Minwax called wood hardener, then two coats of polyurethane, then stipple with a mixture of Gesso and texture paste.
Al - if I would have to guess how long it took, I'm guessing a couple days I'm one of those guys that work on a couple hours then put it down come back a few days later and work on it some more.
Thanks again for the nice comments: Jim