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I started by Adding some extra support to the external wall. Afterall, This was big and a stadium has Supports all throughout.
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So The frame got some extra work, and I added a floor between the 1st and 2nd Balcony.
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Then it was time to add some "Concrete" to fill in the structure and cover up the framing.
This gave the underside a beefier look, But un-fortunately hid all the frame work.
I may decide to leave a section un-covered to show the framework design but for now this will have to do.