I think finally done.

Here are some screenshots of stages of development and the many different tweaks.

In the beginning I started with just getting the whole image (the one with squares in the middle, but there were also some lines remaining and visual issues.

Then I moved on to make the amount squares used to be 4 x 4 that way more quality could be saved and that looked a lot better.

After that I started to utilize cropping to remove those squares and ran through some issues with measurement so I used a pixel ruler to get accurate cropping.

After a lot of tweaking such by filling in the gap left from cropping the white square, and how many imagese to stitch together in one, I finally was able to get a good product out of the program and while it does look good there are dark lines where the stitches are, but I think that is good as this was not a program to generate full quality pictures from a photo company, but to generate a good full preview image.