Just finished reading through this, and boy do I wish it was around when I did my first one a couple of years ago. But, on my first rebuild I didn't replace the rear sprag springs and rollers and guess what failed about 200 miles later? Talked to a couple guys afterwards and was told that it's an automatic to replace those every rebuild since they're so cheap.
Is this something that the OP and the rest of us 727 newbies should worry about?