My daughter made one from the tissue wrapping from a baguette ..
It can be so much fun ...
I found the 'bubble plastic' (packaging etc) very suitable. It had body to keep shape, and was very light. I used the 2/3's rule for the cross bar. Approx 2/3's up and a bit more to suit what i had seen on others. The trick was to get that cross frame to balance. So i had it on a table and rolled the main long axis untill i got a good stable balance with the cross bar. Then bits of gaff tape to tune it after the covering was on. Finding some very light, spungy, packaging material made the whole difference. I stuck it to the top triangle edge of the main covering. When some bubble plastic was applied over that and streached down about half way, it formed a aerofoil/wing type shape. Bamboo slates from one of those Indian type blinds gave good stiffness. Just taped directly on the bottom side longitudinally. The weight of the fishing line made a big diff as well. I was suppried at how much drag it created.
A total hoot (grin). I'm all kited out though currently. Maybe in another ten years.
The FVWM wm -=- www.fvwm.org
Somebody stole my air guitar, It happened just the other day,
But it's ok, 'cause i've got a spare ...