You have to keep in mind that EACH ACRE needs to be a full 16x16 grid. Only laying down one line of pattern to mark off the edge of an acre ends up being confusing, because you might forget which acre that line belongs to. I laid down a line around the entire square of one acre in one pattern, then the next acre was outlined in another pattern. This way I was sure that all the squares in and including that pattern belonged to that acre.
By only laying down one line of pattern to mark off the 16th space, you end up forgetting if it's the bottom or the right or whatever side of the acre you were counting to.
Here's a pic of one of my intersections.