Dan, I KNOW I've never seen anything as gigantic as some of those kites! Quite impressive I might add. I'll check out the YouTube info, too!
Thanks for the info. 
It's amazing how wide ranging kites sizes can be. From single little Eddy's ("Ben Franklin kites") to huge delta-conyne's that can lift buses, there is something for everyone.
For fun, and to prove it could be done, a few years ago I made a
very small kite.
Ended up being about 1.4" by 1 inch, weighed about a gram and flew on a long hair, indoors. I'll have to search around, but I have pictures of it.

-K