I found only one incident where a transport plane (C-46) pilot was "credited" with a shoot down.
Search for Gayda in the story below:
https://www.wearethemighty.com/artic...the-himalayas/
So a C-46 (not a C-47) and using a cockpit window (not a porthole window). The pilot,
Walter Anthony Gayda may have been awarded a Silver Star for the incident:
https://valor.militarytimes.com/reci...cipient-47129/
Walter became a commercial pilot after the war. In 1957 he was married (very briefly, as it turned out) to an actress.
https://www.newspapers.com/article/h...tin/186822341/
(For the next facebook link, use the X to close the top warning window then use the back arrow in the upper left to move "back" to the story:
https://www.facebook.com/chaewon.cha...6781858116505/
https://en.wikipedia.org/wiki/Rosa_Rosal