Add to that the fact that it is made of no specialist materials at all, and you're ready to make a tiny marvel.
(I'll highlight the materials you need as we go along, but you can substitute many other materials at most stages)
Step 1: The Template
The Eddy kite was revolutionary in its day, the first diamond-shaped kite to fly without a tail, thanks to a unique bagginess to the sail. This version needs a tail because it has a traditionally-taught sail, and has simpler proportions.
The size is not important, but the proportions are. Based on a square, it is trimmed off by one quarter of one diagonal. The shortened diagonal is the centre-line of the kite.
The size of this kite is governed by the spars I used. For no particular reason, I chose to use the bristles from a yard-broom. The bristles were just over 7cm long, which made the basic square 5cm on a side.
I drew the template out on squared paper (the squares are 5mm across) to save the effort of constructing a proper square on plain paper.
Step 2: Cutting the sail.
This made it very easy to cut the sail, as I simply laid the plastic over the template, and used a sharp craft knife and metal ruler to cut it out on my cutting mat.
It is important to press firmly with the ruler, and to hold the knife-blade at a shallow angle when cutting the thin plastic film.