Thanks everyone! I think being mistaken for an action figure is about the highest compliment I could receive.
I got the helmet from this guy on eBay (after spending a few weeks contacting every acrylic manufacturer I could find). I had him modify it so it was 14.5" high. It does have a little ventilation from under the collar in the front and back but it was still pretty hot in there. If I do wear it again I may try to add the Oxygen tank but I definitly need to look into a bald cap. I shaved my head for the first time to pull this off and it is not a good look for me.