For this diamond, you need two long lengths of 5 mm (3/16 in.) wooden dowel—at least 1.0 DL (120 cm, 48 in.) each. They are easily cut to the length required with a small hacksaw.
Prepare six lengths of electrical insulation tape, each
one about four times longer than it is wide. Stick them by a corner onto
something handy like a table edge. You can remove them one at a time as
needed.
As mentioned earlier, there's more kite making on this site than you can poke a stick at. :-)
Want to know the most convenient way of using it all?
The Big MBK E-book Bundle is a collection of downloads—printable PDF files which provide step-by-step instructions for many kites large and small.
That's every kite in every MBK series.