you could probably fabricate them with perspex quite easily. I wouldn't use a jigsaw to cut them though, by hand or a small circular saw would be best. You can then use a heat bar or a heat gun to flex it into shape if needed.
As for holding it in place it would be quite easy to cut up some aluminium and bend it into shape ( like an L ) rivet/bolt the sides in, or even make them removable.
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