A replica of the inner window of the Apollo Spacecraft.

I've used M2.5x10 screw for the front and M3x10 for the body.

REAL APOLLO COMMAND MODULE WINDOW INFORMATION:

The CM has five double-pane windows: one hatch window, two side windows, and
two rendezvous windows. Each of these windows consists of an inner-pressure vessel
and heat-shield windows. The structural design philosophy adopted for the CM inner structure, which is the CM primary pressure vessel, was that all windows would be double-pane windows for redundancy and made of tempered glass. The cavity between the two panes would be evacuated and backfilled to 7.0 psi with dry inert gas. The windows were to be mounted to preclude installation stresses, thus restricting the glass loading to differential pressure.