I did try what you suggested, but once I extuded and set the thickness perameters, it turned into something that didnt even look like an airplane. I messed around with the sub-menu settigns for extrude with the same result. I even made sure to reverse the faces so they could be seen from the inside. Like I said, Im very new to modeling but I am determined to figure this out. Im hoping to show up for class tomorrow wth the airplane body hollowed out and ready to work on windows. Is there a simpler method to making this happen, or a newbie-proof method?

Thank you!