does your college have metal frame beds?
it's not that big of a deal. get 2 2x6's the exact width of your dorm room, and 4 2x4's the proper height. get 4 short lengths of chain.
make 2 wooden frames. you don't need any bracing material because the walls of the dorm room will keep it from falling over. use the beds as the cross members, and use the chains on each corner of the beds to hold them up.
i'd suggest you build or buy your computer desk separately, for optimal flexibility. i'd actually suggest just getting a DIY desk kit from wally-world for the lease amount of hassle.
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