I’m not seeing anything obvious from this side, are you sure there’s no access from the inside?
If not I would guess that you need to remove the strips from around the edges, similarly to deglazing a window.
Judging from the age of the surrounding hardware you’re going to be lucky if you find fluorescent tubes and an old “magnetic” ballast. Consider changing that out for some LED strip lights, it will be similar in cost and last much longer.
There’s no shame in a nice plywood patch, as long as it’s temporary.
Plastic probably isn’t a great long term solution anyway, unless you have a handy neighborhood Tap Plastics… those are large panels that need to be cut from a big sheet. It’s probably acrylic which starts out fragile and just get more brittle with sun exposure, cleaning chemicals, air, etc. ;-)
You could try to replace them with polycarbonate but I’d check on the price of getting some glass cut and laminated. You could even just turn it back into a window. Definitely seek advice on how to “reglaze” the windows from YouTube…
I tried to substitute modern silicone caulk for crummy window putty once. Then I cracked the glass and spent a week scraping out the very tenacious caulk. Turns out sometimes the old ways do work best.
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