Great start, very nice floor and wall textures. Glad you are able to get back into CC3 so quickly.

The only issue is that you may have missed the comment in the original post that the original map grid is 10 ft squares but the battlemap needs to be 1 inch = 5 ft at 100 dpi.
So you will need to double the size and the grid should look something like this:

Click image for larger version. 

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