Measure the operating envelope
Record rack-unit count, chassis depth and rear connector clearance. Use the real equipment, the same orientation planned for transport, and one agreed unit system. Catalogue dimensions alone may omit knobs, feet, plugs or temporary attachments. For this rack case, the evidence set should explicitly cover rack-unit count, chassis depth and rear connector clearance.
Photograph the tape or calliper position and label every dimension. The measurement set should show the rigid body, the largest operating envelope and any part that is removed before packing, so reviewers do not combine incompatible values. Keep rack-unit count, chassis depth and rear connector clearance visible in the review record for this rack case.
Turn dimensions into usable clearance
Review rail position, cable bend radius and front-to-rear airflow. Clearance is a functional decision: a connector needs room to bend, a control needs hand access and a moving part needs an unobstructed path. Do not add one arbitrary allowance to every side. For this rack case, the evidence set should explicitly cover rail position, cable bend radius and front-to-rear airflow.
Mark surfaces that may support the load separately from surfaces that must remain untouched. Confirm where foam or restraints may contact the equipment and where ventilation, optics, displays or controls require a protected gap. Keep rail position, cable bend radius and front-to-rear airflow visible in the review record for this rack case.
Cross-check the loaded workflow
Validate loaded centre of gravity, shock isolation and service access. Make a simple packing and removal walkthrough with the people who handle the equipment; it often exposes missing grip space, an incorrect orientation or a lid that cannot be stored nearby. For this rack case, the evidence set should explicitly cover loaded centre of gravity, shock isolation and service access.
Issue a dated measurement sheet with photos, units and equipment version. Before fabrication, compare the drawing with that sheet and record any change to accessories, connectors or operating position. Keep loaded centre of gravity, shock isolation and service access visible in the review record for this rack case.