Well I made some doors for this cabinet. I went to put them on the cabinet and they're off. Hmmm. I checked and rechecked square. So I took out my best tape and measured for square. dead on to a 32nd ! I mean dead on. So I measure the cabinet. As expected. Off by 1/16th. Wider at the top than the bottom. But at least it wasn't racked.
So I planed the edges to fit. Le sigh.