They said they had picked up the work from someone else, and that many people were sharing in it. Each person who built a building added their name to it. My daddy wouldn't let me do my Godzilla impression and walk among the buildings, though. It was a very neat improvised idea. Many people donated their spare cards.
Daddy says it was eventually demolished for charity, after strong bidding by friendly gamers.
I will miss Cardhalla. There were two men with nice shoes, dark suits, and no GenCon badges who walked around the show and talked with Mr. Gary. We don't know how they got in without badges. We also noticed Mr. Gary kept being distracted from the Hekaforge booth to run seminars that were scheduled last minute. He was very busy.