I think so far this one looks the most air worthy. (Not that I really know what I'm talking about
) My only suggestion would be to consider making his arms a little more straight out to his sides, kind of a mid flap situation, and maybe give him a little dihedral. This would make it a little easier to keep the CG right and take some of the pressure off of the vertical stabs, ie... his feet. Just a thought but I love the idea.