i have a smoke stop door on mine heavy as fuck solid rimu with a frosted glass panel with steel wire fused into it (lets in light but cant see in or smash thru.... i sold 2 more of them for $1 each on TM) the foundations of the building are poured concrete which come up around metre and a bit in height and 8 inches thick as are the wall cavities (give or take) steel bars over the windows in a manner that cant be levered off
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