We have a winner!
(Newmarket, Ontario, Canada)
I helped my 11 year old son build this for his class project in science as he was studying the principles of flight. Half of the grade was design, the other half was flight. I had to help tie the string securely but he did everything else.
We made it using an extra large black garbage bag, duct tape to hold the sides and 15lb braided fishing line for the kite string. The duct tape really worked out well in holding it all together.
Good news is he won best Kite in his class and went on to win the best against the other classes. The teacher asked to keep the kite to show the kids next year.
Thanks for the detailed instructions.
As mentioned earlier, there's another alternative to towing indoor kites if it's just not possible to fly outdoors...
"Kites Up!" is my downloadable board game. It's a PDF file which has all the documentation for the game plus images for all the components. Tokens, cards, the board itself and so on. Anyway, just click that link to see more info :-)