Personally, I loved the Hangout... Which I think was super obvious seeing as I spent most of my spare time in there laying on the floor.
For next year, I'd definitely say fans wound be a good idea, either oscillating floor fans or those little battery operated hand held ones so cold air could be maneuvered into hot armor easier.
Also, I don't recall having a floor length mirror, but that seems like it would still be a great idea.
I didn't see it on the list, but would a small hair dryer be good? To be used to help paint or glue or the clear nail polish or something dry faster?
I can also bring things like bandaids, q-tips, and cotton rounds.