Keep nominal depth out of the aisle calculation.
For an example only, a 400 mm-deep base with a 50 mm projection beyond its front edge occupies 450 mm from the same rear reference. That is simple geometry, not a recommended fixture size. If goods project farther still, use their outer edge instead. The smallest detail can decide whether a narrow room remains workable.
Mark door swings and the full travel of any adjacent drawer. A piece can fit between two closed cupboards yet block both when it is used. Where a fixture is near a route through commercial premises, tell us the clearance requirement already established for that location. This fabrication enquiry is not an accessibility or fire-route approval.
Choose the finished height, not just the steel height.
A surface adds to the frame height. For example, a 25 mm top placed on an 875 mm support gives a 900 mm finished height. Those figures illustrate the relationship; they are not a standard height or a recommendation for a particular user. If a surface sits inside a frame rather than on it, the section drawing changes.
Decide whether the intended height refers to the main surface or the top of a raised edge. For a packing station, a container on the surface also changes the hand position. Small space steel furniture should be sized for the actual task, not for a photograph of an empty worktop.
A finish has to suit contact with the piece.
Tell us which surfaces are touched and which are likely to be scraped by stock or equipment. A dark coated finish and exposed steel have different upkeep implications. Finish choice does not remove the need for a sound edge detail, and a raw appearance should not be mistaken for resistance to moisture. Any special cleaning or material-compatibility requirement needs to be stated before a finish is discussed.