[Model] 3D door windows

I love everything about these models and the future of Minecraft with them.

And I haven't been excited for the future of Minecraft since beta 1.8.

Pretty cool! You should do the same with trapdoors!

Download: http://www.mediafire.com/download/5l2unffowfv88kw/3D+Doors.zip

If you haven't done this already, couldn't you optimize this by having only 4 squares, but just invert their coordinates so they are inside out.