If you look at the history of the Goa'uld coming to earth 12000 years ago and ruling most of the Galaxy for nearly as long, Jack ended all that within the confines of a single decade.
If those shelf brackets are fixed in place and screwed in with two screws above each other that’s probably enough diagonal bracing for lightweight use, considering it’ll normally be screwed into a wall too. The fact that theres no horizontal bracing at floor level might be a bigger issue — those feet will be easily bent/broken
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