Eh no.Wouldn't that be 124 tons then because the weights per door double but they should add together as well i.e. door 1 = 4 tons(2 per side) door 2 = 8 tons(4 per side) opening 2 gates = 12 ton. Right?
Each gateway has 2 panels, the first gateway is 4 (2 tons per panel). Your not doubling each weight of the panels but just the gateway in general, so 2nd is 8, 3rd is 16, 4th is 32, 5th is 64, 6th is 128, and 7th with 256 tons.