yeah i've done it on a coupe before. take the whole door sized sunroof bracket out and just get plexi and cut it then sand it so it BARELY fits in... then put weights on it (roof isn't exactly flat) and cock top and bottom. there's a small lip inside that you can bend out a little. then we just fabbed some ghetto metal brackets for the backside of the sunroof and bolted it in with like 5/8 or 3/4 sized bolts you find at home depot they only need to be an inch long or so, pile on some washers and bolt it down, it's super super secure and durable. and NOT LEAKS. it's amazing and looks really cool too. there's my 2 cents. we ordered a good sized piece off ebay for around $30 - $40