Wow... especially those last few group pictures really scream 'Alcala' and 'Mini Comics' to me. Very economic use of Demo Man indeed, with the 2nd head on Skelly and the feet on Beast Man.
By the way, a bobble head can easily be fixed by putting a small layer of... eerhm, I'm not sure what the American/English name for these things is but here in The Netherlands we call 'em 'Poster Buddies'. Those small tape/clay/glue like squares you can buy in an office store to hang posters or stick photo's on a wall. It will keep the heads fully poseable and rotatable as this stuff is flexible (thinking about it, it feels a bit like chewing gum) yet it will keep them from bobbling around. And it you want to remove it afterwards, it is easily removable.