For some reason I have not been keeping up on this build and just saw it again today. Very timely, for me since I just started a sinew job of my own (my first.)
This was great info and really reinforced what Pearl Drums described as his method. Main thing I see is that I need to lay some more courses. I didn't get near enough sinew on the back. Otherwise, you have done a super job of explaining and photographing the process.
Thanks much
Scott