Jack is right, you have at least 3 panels to replace and $4500 is a good starting point. You could try to punch them out from the inside, but frankly, it will most likely not be anywhere close to smooth. It's not so much parts, it's labor to get the panels off and new ones in properly. One person here just had it done under warranty and they tore the inside front out to get to the outer skin so it could be resealed properly after it was replaced.
Computers manufactured by companies such as IBM, Compaq and millions of others are by far the most popular with about 70 million machines in use worldwide. Macintosh fans note that cockroaches are far more numerous than humans and that numbers alone do not denote a higher life form. -NY Times 11/91