Attached is a picture from the 1946/1947 Fisher Body Manual showing the routing for various body styles.  I suspect 1941 would be the same.  For period correct harnesses and supplies, I generally use Rhode Island wiring but I’m told YnZ has a great product as well.  If I recall correctly, the body harness is wrapped with friction tape rather than woven braiding.  Consider adding one extra wire for signal lights.

Thanks, I was afraid that the harness went overhead, I don't want to disturb the headliner.

  I may route it under the car instead if I can find a good way to go that way.

  I have talked to RI Wiring, they seem to be very knowledgable.

Posted by: @john-worth

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Thanks, I was afraid that the harness went overhead, I don't want to disturb the headliner.

  I may route it under the car instead if I can find a good way to go that way.

  I have talked to RI Wiring, they seem to be very knowledgable.

The harness in a 1941 convertible body is routed under the front and rear floor covering just inside the sill plate.  If you remove the bottom rear seat cushion there should be a way to route it into the trunk area.  You’ll have to figure out a way to get hot wire wire up to the dome light and ground wires from the light to the door and pillar switch.  Mike