The ARMY made 1000s of these shelters for use with teletype machines. I always thought they would make nice portable timing buildings. I never modified mine but it would not be hard to cut several windows in the sides.
The miltary manual for moving them is:
https://www.doctrine.usmc.mil/mcrp/view/mc4113e2/Ch10.pdf
I bought mine at an Army surplus/scrapyard for $750.00
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