If he takes the hat off and just tells the person when he sells it just to stick the hat on and it would look like this : INSERT PICTURE, it would be fine to sell. But since the hat is free I don't think you can sell it with the set, just give them a link to where they can put it on...
On the other note, it looks nice, just biceps are kind of weird idk if they are finished. and the hands defiantly need to be fixed up. But it looks pretty nice for a beat up guy