While waiting for my two new-tool Airfix Mitchells to arrive, I'm watching Thirty Seconds Over Tokyo for inspiration; I found the link attached below while gathering reference material. As the bomb-aimer, cockpit, and navigator station photos/diagrams are pretty rare for the early versions, I thought you might find this link useful. Note: the landing light assembly on the LH wing of a B-25 has two lights- one is the landing light, and there is another smaller light outboard of it that is called a passing light. IIRC the light was red and it was fitted to many USAAF aircraft and was used for right of way when two aircraft were approaching head-on. Nice little detail to add to your model! (I bet I've watched the movie 50 times and just now noticed the passing light!)
Mike
https://books.google.com/books?id=v5gFCwAAQBAJ&pg=PT35&lpg=PT35&dq=B-25+Mitchell+passing+light&source=bl&ots=b5DyJwTjOE&sig=tjSVfyDQUga9EstwMLIzd3U2Qnk&hl=en&sa=X&ved=0ahUKEwilperE3pTZAhVi4oMKHYjhD88Q6AEIQjAG#v=onepage&q=B-25 Mitchell passing light&f=false