Need a Google Maps Grid generated..

Please take a look at the attached .JPG file to get a picture of what I need.

I basically need a Google Maps with a Grid Overlay of squares. I need to be able to adjust the settings such as:

- Starting Square (GPS location)
- Square size
- How many squares to the left, right, top and bottom of the starting square.
- Each square needs to have a unique ID (00001, 00002, etc)
- The marker needs to be clickable/hoverable so I can see the ID of the square.
- All squares MUST be equal size.

Also output to the browser I need the JSON data of the squares in this format:

{"zone":"00001","lat_1":"15.170091","long_1":"104.806800","lat_2":"15.170091","long_2":"104.811800","lat_3":"15.175091","long_3":"104.811800","lat_4":"15.175091","long_4":"104.806800", "center":""}

So for each square, I need the GPS location of each of the 4 corners, plus the center of the square.