Replaced the fisheye portholes windows on my one-off Gulf, Mobile & Ohio PW F-3A unit with P&D Hobby O scale units previously painted by Christine Braden to dolor match the red stripe. Doing so required the holes to be enlarged 2mm or so--a very risky undertaking for my hands of stone.
Also replaced the P&D Hobby O scale portholes I'd previously installed with silver edges with red ones painted by Christine on the companion F-3B unit.
Comparison photos to follow.