Outdoor wireless point to point design help

I need to extend a wireless signal from one building, to an elevated metal enclosure approximately 310 feet away across a parking lot.  The enclosure has 3 metal sides and a metal roof. The front is almost entirely one big picture window.  The building across the parking lot from the enclosure that I need the wireless signal to reach from faces the metal back side of the enclosure.
Currently a yagi antenna is mounted on the building roof and is pointed at the enclosure across the parking lot. The antenna is connected to an old 1231 access point inside the building.
This configuration does not work.  The signal reaches weakly to the outside of the enclosure, but disappears entirely once inside the enclosure itself.  My guess is that the metal back and sides is blocking the signal from the yagi antenna on the roof across the parking lot.   Signals from other access points in the neighborhood can be seen inside the box, and I'm guessing those signals get through because they're in line with the big window in the front of the metal box.
How do I get the wireless signal inside of this metal box?  If I install another antenna on the roof of the enclosure that will boost the signal to the outside of the structure, but how do I get the signal inside?  Even if I place an access point inside the structure and run a cable to the outside antenna, won't the signal itself still be outside?
How do I get the wireless signal from the building across the parking facing the metal rear of this enclosure to reach inside the enclosure?
For those who are wondering - the elevated metal enclosure sits on top of a row of bleachers and looks out over a sports field.  It's used by sportscasters to broadcast sporting events and upload game information to a website. That's why they need wireless inside.

How do I get the wireless signal inside of this metal box?
With difficulty.
You need to poke holes under the metal box (to prevent water from coming up to the AP) and stick the antenna OUTSIDE.  The metal will act as a reflector.

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