UPDATE: I’m still looking for an outer border pattern that complements the Flat Braid Joining Method. If anyone finds one, I’d appreciate you dropping me a note! Beth

Great video tutorial for this joining method:

Flat Braid Joining Method Video

Some notes RE the corner for the fourth block joining (the block I’ve always had trouble with) based on this video:

~ sc in corner of 4th square, ch 2, drop st, insert hook into corner of 3rd block, pick up st, ch 1, drop st, insert hook in corner of 2nd block, pick up st, ch 1, sc in corner of 4th block; continue down the side.

Thank you to the poster of this video on YouTube for these instructions!
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