Check out,in Archives, Grand trunk Western cabooses as well. They have a very interesting “homemade” boxcar transfer caboose.
Just as a comparison, here’s a pic of a New York Central caboose that the railroad created from a wood boxcar during WW2. Note how tall the car is. It doesn’t look to me much like the G&U car.
Now that is a great kitbashing project!!!
To be honest, I originally thought that this caboose was a bay window caboose with the bay windows removed. http://www.rrpicturearchives.net/showPicture.aspx?id=