You can size the window with /viewport X Y W H (I may have the x/y and width/height mixed up) to do something like /viewport 660 0 600 400, which would give you a 600x400 graphical window top centered on a 1920x1080 monitor.
As long as a UI supports custom backgrounds for the windows, I'd think it would be doable (creating a "classic" UI with a smaller graphical window).
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