OpenSCAD 2V dome hub script for different sized rods.

// Script to create hubs for a 2V dome using a certain rod size.
// Dome requires 20 six hole hubs and 6 five hole hubs.
// Will require 35 A (long) and 30 B (short) rods.
// A/B rod ratio is about 1.131:1.
// Six hole hubs are used instead of four hole hubs for base.
// See here for more info http://www.desertdomes.com/dome2calc.html