Rejet
Don't ride in the rain.
Don't ride through street puddles.
Don't ride over ANY street deposited liquids or debris.
Don't ride over rocks or pebbles that the tire can pick up and fling on the filter (and rider).
Don't ride.
Great idea.
Why not print a picture of an open triangle, and paste it onto each side cover? Make several so that you can change the "scenery" when looking through the bike.
Or, how about this? Replace the side covers with flat screens and tiny cameras, to project the image from the other side onto each flat screen? That would hide all the "ugly" but functional stock bits you abhor. You could also attach multi-mirrors to your riding apparel so the bike will look as good as the pictures even while you are actually riding it!