built a quilt rack for my mom that looked alot like that. Chinook.
I used dowels for the cross pieces and too small of screws so it is always getting loose and rocks back and forth. A couple of vertical 1x4s running from side to side above and below the top cross piece would really stiffin it up for the long run.
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When Ma Nature decides to make ya her bitch, aint nothin your gonna do about it