Sky Dancer Building Flexis?

Hi there,
I'm planning on taking up kite builing and am considering a gargantuan sized
delta. Anyway, this has gotten me wondering about flexifoils- how difficult
are they to construct and are there any plans/patterns available?
Also, has anyone heard of or know where I can get a copy of GeoKite or
any other kite design software for either the Mac or PC?
Thanks much,

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