Got the periscope set up using the wedge from before.
I duplicate linked and rotated 180 degrees on 2 axes and placed in using right ortho-perspective.
I then manipulated the angled edge to get a reasonable mirror-like appearance.
Afterwards, I added my viewports by creating a cube, shrinking it, moving it to correct place, and duplicating for top.
Finally, I joined all 4 shapes together and set origin to geometry and moved to (0,0,z).
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