With all the changes I made to the interior squares of this pattern, I thought that the border would take some serious working and reworking to make it look right. However, I was pleasantly surprised that beyond some extra stitches and a little fudging in the # row, it was really simple.
Round 1: 3 sc in each corner, 143 sc across top and bottom, 183 sc across left and right sides.
Round 2: No real change, just more rep.
Round 3: No change.
Round 4: Depending on where you joined on the last Round, you may have to sl st. into two sc to get to the corner instead of one.
Also, with the added length and width, the skip 4 sc between the shells and the sc does not work out right. I skipped only 3 sc, which worked except for a little fudging when I skipped 4 sc two times (on either side of a shell towards the middle of the side).
Round 5: No change.
Round 6: No change.