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I'd thought about using a roller door but as a whole side wall/roof rather than just the ob slit. There are smaller lighter versions (Aluminium rather than steel) used as the back doors on delivery trucks eg which might be easier to convert. Possibly also 12 volt motor operation and smaller roller assemblies available. Weight and water leakage would need to be managed but if it was wider than the slit with internal channels to direct that away maybe.
Worthy of some research and a design exercise I would say. I have also seen clear plastic roller door systems of similar construction.
Biggest problem might be that you would have to assist the closing movement as normally garage doors of that type use gravity to drop down.
Definitely possible in my books.
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