The following eight steps detail how I made my TARDIS kite, in the hopes that you might be able to make one too.
Step 1: Materials
Seven 36" Dowels, ¼ thick
15-20 yards of extra kite string: For each section you lash together, you need about a yard. You only do that 15 times, but it's good to get extras.
2 Plastic Bags (Or you can use ripstop nylon! JoAnne's has it for $8 a yard, I will make another kite and show you what it looks like!)
Blue Spray Paint
Black and White Acrylic Paint
Spool of Kite String
Step 2: Cut Dowels to Length
I had to cut all of my dowels, ending up with four 36" pieces, and six 15" pieces. You can see the plan I used above ^
Step 3: Make the Cross-Sections
Use a ruler to find the middle of the 15" dowels, and mark with a pencil. Take some kite string and tie it around the middle of one of the sticks, using just a plain granny-knot. (Picture 2) Grab the other dowel and make an "X" , holding it with your left hand, and then start winding the string around with your right hand, going under over under over. (Picture 3) Once you get a good amount of lashing, bring the string between the sticks a few times and then tie it off.
If you want you can add a bit of hot glue to hold the knot better.