Step 1: Ice kite buggy didn't work so well
Step 2: A brief introduction to kites
Step 3: It's all about the edge
Step 4: Turn to leeward!
Step 5: Use scrap material and expensive machine downtime
(download the zip file full of all the CAD drawings)
I designed it to use abrasive jet machined aluminum connectors and extruded aluminum bars. The blades were also jet machined from stainless steel and sharpened to a 90 degree angle by hand. The flexure is polycarbonate. You could accomplish the same thing with scrap steel from a bed frame welded together.
Step 6: It's fast
The plastic beam on the leeward side is a flexture that turns the two skates. Push out in the center at the footstrap to go upwind, pull in to go downwind. The flexture is rigidly attached on one side and slides on the other.
Step 7: Action!
Step 8: More details
Step 9: Improve
Step 10: If you do nothing else, watch this one
Step 11: Safety equipment
Check out the image notes for specific safety gear. More information here.