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You're welcome.  It does has its limits.  Once you have made the pixel pattern your want, you might want to create a duplicate with Image > Duplicate  and upsize the duplicate.  Reason being is that all edits need to be done on the pixel level and once upsized, all those pixel tricks go away.  So keep the original pixel level image, make changes from it, duplicate, then upsize the duplicate.

Lots of ways to make the grid you want.  There is more flexibility if you upsize to a much larger image so the street size of the gird is larger than two pixels yet it all depends on what you want.

Hope it helps

John Wheeler