I probably would have made bigger windows, but it looks ok as you did it. I have even made a larger center window with smaller windows all around. I...
I'm not even going to tell you which one to throw (if any) - based upon all of the responses here, we vary widely depending on our individual tastes...
There is a list of manuals at ISMACS (International Sewing Machine Collectors' Society).
The first link will take you to all of the Singers - if you...