This is superb. Pat Hodgson (aka 'The Dark Master') has produced plans (complete with a few renderings) for an adjustable deadlift/shrug/row bar. As all three of these exercises rate highly on my list of 'fun things to do in the gym', I can definitely see this getting a lot of use.
The plans have been made freely available [.pdf, 1.1mb]; all that's requested is a photograph of any that are built. Any welders out there?