How can I determine the size of my steel structure materials?

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1. Support equipment: Reactors with a nominal diameter of 1600, with a weight of 5.3 tons (including the mixing mechanism); the weight of the material inside is 5 tons. There are 2 mixing motors, each with a power of 7.5 kW. Reactors with a nominal diameter of 1200, with a weight of 1.5 tons (including the mixing mechanism); the weight of the material inside is 1 ton. There are 2 mixing motors, each with a power of 7.5 kW. Reactors with a nominal diameter of 1300, with a weight of 2 tons (including the mixing mechanism); the weight of the material inside is 2 tons. There are 5 mixing motors, each with a power of 7.5 kW. Reactors with a nominal diameter of 1400, with a weight of 3.8 tons (including the mixing mechanism); the weight of the material inside is 3 tons. There are 5 mixing motors, each with a power of 7.5 kW. 2. Number of devices: 14 in total. The distance between adjacent reactors is 1.25 meters. Please help me figure out how much material I need to use for my steel platform