Yes I believe you can use fiberglass window screen, but you then need a frame for it. Might be easier to use a rigid screen like those linked earlier, or the pre-seeded ones from IA.
Not sure how an angle would be easier... you still need good controlled flow coming from the spraybar, and that seems the tricky part. I was just thinking about those tabletop ornamental waterfalls that flow down a sheet of glass; maybe I can use the spraybar from one of those.
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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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