Figaphobics make a kite...i.e. what not to do.

I will start by saying find the website below and follow the instructions a LOT more carefully than we did. 

 http://www.my-best-kite.com/how-to-make-a-sled-kite.html

This is what we rustled up from our junk trunk...skinny tape that was too skinny so we had to go and find the wide tape. Scissors, a plastic bag and some doublesided door draught excluder tape that fell off the door anyway and turned out to be pretty useless for kites too. So you can save yourself the bother of buying any :o). 

These are the proper dimensions. But I have to admit to being a figaphobic, so we kind of winged it.

If you really look hard at this plastic bag you'll find the blue felt tip that is very hard to see.

We cut out the basic pattern... 

...that shows up a lot better on the website
 http://www.my-best-kite.com/how-to-make-a-sled-kite.html

Jake cut out the little vents.

Both of them.

This is where we put the insulation tape at the ends of the two sticks we
knicked from the garden.
The plants they were holding up had died anyway.

See at this point we were really happy to have found something to use the draught excluder for.
Until it started peeling off and we had to tape it down anyway.

That's me holding the tape.

Our sticks were a little short...

...but we hope you won't notice.

This was where we used wide tape to reinforce the pointy side bits where the string should be attached. 

We had this old Duty Free bag and as we thought our kite looked boring, we taped it on. That meant it all got a bit top heavy but our kite is only a figaphobics prototype not a proper one with all the right measurements like yours.

We didn't have string either but we did have an old retractable lead of Watson's that was quite long and didn't retract any more. So we cut off the end and used that. Watson got all excited and thought he was going for a walk, so we had to take him and that took a while. 

But finally we had something that looked a lot more like a kite than Stanley the Stork. ..but is about as effective.
Of course, because we hadn't followed the measurements correctly,
we're still waiting for a big enough gale to get it off the ground.

Hope you have better luck :o)