@gsuberland Back in the early Cisco days (mid 1990's), when they transitioned from AGS+ to 7000 boxes... The dimensions of the cabinet of the Cisco 7000 were precisely set to be the width of an open-frame 19" telco rack. With no margin for error.
We had our techs out in the telco colos with car jacks trying to wedge these things into racks. You gotta leave just a little margin -- floors are not levels, the racks are... racked slightly, etc.
It got better. We all learned a lot in those days.
@lmamakos reminds me of the phrase "trying to land the plane and run out of fuel just as the wheels touch down"