Quoting Abby Francis
Epic build (And I'm not sure I will be able to sleep tonight with HIM watching XP) but how the heck did you do the hat!?That's what I want to know!
Thanks! The bottom part of the hat is the large flat piece that can be seen as the table in the upper right portion of this picture: http://cache.lego.com/e/dynamic/is/image/LEGO/10188?$main$ Attached to the four studs in the middle are two of a relatively new piece: it's the one that's basically a 1x2 plate with another 1x2 plate attached to it perpendicularly, studs facing out (can't find it on Bricklink, sorry). Then a technic cylinder is simply placed on top, with the two 1x2 funky pieces keeping it from sliding around too much. Hope that helped ya!
P.S. Copy and paste that entire link into your URL bar, including the final dollar sign. Not sure why that bit's unincluded, but the picture won't show up without it.