in the middle of the outer hole over the inner hole the steel oasis ---------------- a 3V 5/8 dome made of 165 1" emt struts weighing .67 lbs per foot. The total combined length of these struts equals roughly 32.8 times the dome's 14' diameter.
So, about 460 feet for 308 pounds and, allowing 10 lbs for the hardware 318 total weight