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Plastic is a fine choice for a retractable dome roof, but you don't have enough money to build one!
Olympic Stadium in Montreal, Canada, was one of the first stadiums to be capped with a retractable dome roof made of Kevlar, a plastic fabric five times as strong as steel. A complex pulley system from a nearby tower opened and closed the dome roof in less than 90 minutes.
There's only one catch: retractable, plastic dome roofs can be expensive to maintain. In fact, the retractable roof over Olympic Stadium became so expensive to maintain -- it cost over $700,000 in annual upkeep -- that it was replaced with a permanent, plastic roof in 1998. You probably don't have enough money to build a retractable plastic dome roof, so why don't you try building a cheaper dome?
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