I mentioned before that the sleeve pleating worked like a dream. The back also pleated together easily; however, I forgot the check to pleated size against the yoke before I tied it off. I actually over-tightened the back pleats, so I had the fun of re-pleating the back a second time you'd better believe that I checked it the second time.
I attached the sleeve and back to the yoke using one backstitich through each of the crests in the pleating. I made sure that my needle passed through the pleat padding which kept everything very well anchored and did not put too much pressure on the wool.