Okay, you don't have to believe me but the piece of calculator tape in my hand from yesterday (I'm an accountant)actually ended up at 288"! That seemed a little high to me so that's why I went with 280"ish.

Of course I was probably off on most of the individual measurements.

On the left side I went G1 - 15", G2 - 12", G3 - 15", G4 - 20", G5 - 2"
On the right side I went G1 - 15", G2 - 10", G3 - 6", G4 - 20", G5 - 5"
I gave both main beams 36" and the inside spread 36" and gave the circumference measurements 30" for each side.

P.S. - That is Gross Score. With the weak right side it would get knocked down a bit on the Net.