A moonroof is not available on any element over the front seats. yes, you may find an aftermarket shop that know nothing about the vehicle to put one in. But, and this is a big but, you will no longer have protection in an accident. The b-pillars main strength comes from the completeing of the safety ring; in the floor this is via a cross member, in the roof it is a very similar setup just reversed, you know, it's on top. Should you cut this you will lose the majority of the vehicles structural integrity. Sorry, I'd rather live to see the sun on its own terms than die trying.