Aviation inspired desk lamp / Shade (*** redesigned)

Continue to enhance beautiful engineer's lamp.

http://www.thingiverse.com/thing:319339

A try to enhance the rather simple original lamp shade.

Redesign took me about 16 hours.
I have done it from original photo into a seams-to-be-same designed shade.

Optimized to print without supports, use 2 files:
lamp_shade NEW1 front.stl
lamp_shade NEW1 back.stl (with supporting grid to be cutted away)

otherwise use supports
lamp_shade NEW1.stl

Also the source Rhino file is at