Engineering involved in Kite Making?

I have a question for those people who design and construct their own kites-

How much of the process involved in your kite making involves calculations
(estimations) of aerodynamic/structural properties, i.e. location of center of
pressure, the amount of camber, and the frame members spec's to get 
specific pull (light flight or power- considering the strength-to-weight

!I know that there is an "artwork" aspect to it (who wants an ugly kite?),
 but how much 'engineering' goes into it?

A curious aerospace engineering student-

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