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Hello bosom friend!
Styrofoam can plug leaks, but better is to make a rain shield on top of it.
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If it's so wide, buy a profile plug! For example, aluminum alloy, square pipe, PVC, etc.!
It can be sealed, but whether you want to seal it or not depends on your personal thoughts.
Personally, I recommend using tempered glass and film, which will be safer, and at the same time, it is recommended to open the mouth, so that you can enjoy the balcony and clean it.
If the structural adhesive is bonded to the aluminum alloy frame, it will be foolproof!
As long as the property agrees to be closed, there is no problem. But it can only be a steel structure or aluminum alloy structure, and another is to deal with the cutting-edge sink, otherwise the rainwater on the roof of the sun will affect the people downstairs. Mine is exactly the same as yours and is doing. I answered by the way. Hehe.
Of course, Cao steel is used, and then anti-rust treatment is done.