Here's the cool part ... you can do it however you prefer.
The borders are really nothing more than additional sections - just long and skinny.
QAYG and attach the 3 main sections together, then QAYG the border strips before you attach them using whichever QAYG method you like best.
I've got a border in the works myself right now. Soooo much easier than trying to handle the whole thing at once.