Joining together shouldn't be that hard. It would probably take a few days of consistent effort. In the original pattern, they are joined by using yarn ties through the corners. I certainly don't want to seam all 800 together. (I wouldn't even want to seam 100 together!)

My main concern is that my colors might be markedly different when I get into later puffs and I want the whole thing to be a big crazy mishmash without an obvious break in color usage.