You'll need more stuff. The big thing that is missing is a ~8" section of square tube with "ID" slightly larger than the "OD" of the existing vertical square (similar to what is under the bench). Weld a piece of pipe onto this square tube for the weight plates. I sketched it up...but maybe the weight should be over the bump stop, I'm not gonna resketch it. Cable routes from that, up to pulley #1, thru the tube to pulley #2, along the top bar to pulley #3, then thru to your lat bar.
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