FiltersLayout

Would it be possible to create a custom FiltersLayout? We have a client who is adamant about having the filters on the left side of the screen persistently, like many shops have for their stores. The layout of the slideout modal is the closest to what we want, but we can't get it on the left, nor can we get it to stay in a non-modal. I've been trying to figure out how to create it but I'm not sure what the best way to go about doing that would be. Anyone do this before?
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