NC - Surface mount steel boxes on the flats, between ribs , secure w short sheet metal screws.
Punch slightly oversized hole in metal panel to allow enough clearance for Romex connector or whatever you are doing.
Flush mounted pain in *** and totally unnecessary.
Should be totally normal and acceptable for Inspector, I was an EC for years, did that many times in different jurisdictions. Marc
This is the only way I will do it if the customer wants Romex. Flush mount never looks good even if you're fussy and is more work for everyone involved.
