The bigger it is, the more hot air or heat energy you will get, but it will also be followed by a large construction budget. The organizers therefore thought that this size was not larger than the dome and was enough to control the budget.
The hotter the weather, the greater the thermal energy, but the higher the construction budget. The organizer believes that this size is not larger than the dome and is sufficient to control the budget.
The bigger it is, the more hot air or heat energy it will have, but with it comes a huge construction budget, so the organizer thinks that the defined scale is not larger than the dome, which is enough to control the budget.