The Inglewood plant (B-25C, G, H) assembled the aircraft (including wings) on-site - the Kansas City plant (B-25D, J) got complete outer wing assemblies, fuselage side panels,control surfaces, and transparent enclosures shipped in from the Fisher Body Division of General Motors (which also built the FM-1 & FM-2 Wildcats).
The racks of wings might indicate KC.
Here is a photo of the B-25D hall at KC in October 1942 - note the painted control surfaces but primed main airframe; it looks like the outer wings on the airframes in the background are in primer only, however:
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