Space Shuttle on launch pad - fixed

For ROTOSCAN's Space Shuttle on launch pad model.

For the aft section of the orbiter I reversed one face on the wing section and several faces on the tail. This should slice better for people having trouble printing this section.

For the mid section of the orbiter I added a peg hole for attaching to the external tank. Hope it's in the right place.

For the fore and aft sections of the external tank the peg holes didn't print right for me. I fixed them by inverting a few faces in the ST