Thank you guys! It was pointed out to me that the side windows should have been mounted from the inside. I checked the instructions and they do mount from the inside! I had interpeted the instructions wrong, so I corrected my faux pas. Removing the chassis and interior gave me a chance to correct another issue that was bugging me...the front of the body doesn't fit correctly over the chassis. The dash is holding the body up, so I starting removing material from the bottom of the dash and the center console. After a lot of grinding, sanding and cutting, I got the front of the body down far enough to satisfy me.