Not really plans, but here are the measurements of my cab.
It's based on my own preferred ergonomics, not any actual arcade cabinets.
It has worked out well for me. After years of using it, I wouldn't change any of the ergonomics or screen angle.
It is 32" wide to allow the 27" monitor to rotate. Wide enough for some 32" LCD TVs to fit.
It think it would look better 24" wide, but I'm old.