[dcb]

it should be fairly easy to plug up the big holes in the front of your car with lexan. Just hold the clear lexan over the hole, and trace out the hole with a marker. Then cut out your plugs with a jigsaw.

I would probably paint the backside black so it is shiny black on front, rather than let it get grimey looking, if you worry about that sort of thing.

Also several dabs of hotglue or silicone can be pretty easy to remove/clean up. Or a couple small holes in the lexan and some black zip ties/bits of wire will probably suffice.