60601/60602 glass & 60592/60593 windows

[Philippe Hurbain]

updated windows and glass for comments
original parts in gray/smoke
new 'g' parts in white/clear

They look good!

no offense is intended to original author(s)
these are rewrites - tried to utilize as many rect and box primitives as possible to reduce line count

Just don't forget to keep original header (author and history)!

Otherwise, there are unintended T-junctions at junction between bottom stud centering ribs and frame (the triangle joining them is too narrow).