I've worked up a release-able Superfly material setup for Stonemason's Level 19:

This shot shows both of the doorsets. The doors on the left have a solid wall slab behind them, so I made a billboard to slip in just behind the doors; the billboard uses LightPath ambient boost and actually casts light into the Level 19 main room! :D

The doors on the right can be opened/hidden, and I made a T-shaped corridor to give the camera something to see through the door glass (or if you have the doors opened).

The new add-on corridor:

This is Stonemason's add-on cargo bay doors for Level 19, with my Superfly material setup:

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5