Certainly a popular topic of sticking with the original top and a new plastic window or going with a new top and glass window. Here's my result of paying somebody to stitch in a new window!
I assume they cut out the existing stitched area as it wouldn't be ideal to re-use. That certainly extends the window 1/4 to 1/2 an inch in each direction.
I paid $100 for the window and $650 for labor. He quoted me $150 to sew in a new window if I took the top off myself. I strongly considered it but I'm terrible with fabric and I read the instructions 20 times before deciding.