That won't work. If you compare "O-12" (example) to the two different grids, the place is not the same.
Look at post 283, the quote still shows DD's board the way he has it set up. I can't quote it here since it's in the quote. His pics seem to have disappeared. I think this works with his. He did it backward from the way excel does it, and some others did their grids. IE #'s down and letters across. Gonna see if I can enough squares on my excel one to have letters and #'s on both ends without messing it up.