Novice Builder - box kite with pvc pipe frame

[Max Prestridge]

1st time box kite builder wanting to use pvc pipe, and couplings for frame with ripstop nylon sails. Plan on using light gauge small diameter pipe.

Saw basic plans for 42'' high by 18.5'' width. Sails are 12'' high.

Do I need to make size dimension adjustment for added pvc weight?

Looking for rule of thumb answers.

Any other insights as well.

Max

[frob]

That seems awfully heavy for the size of the kite. Given enough wind and a proper bridle it can probably fly. 

As for the rest, apart from a few basic equations for angle and surface area, even NASA kite sails have an experimentally determined value, basically they fly the kite and measure whatever it really is.