Today, I've been continuing the riveting moving forward on the TC. Based on pic 2 below, I'm moving southwest.
You'll note from the other two photos that I'm doing the pilot side with the CP side removed for access. Thus far, there haven't been any issues with this method. In fact, I'd even recommend this method.
The good news is that as you move forward the clecos come out...for good. Less stuff to get in the way.
I'll probably still do some backriveting, but I prefer this method. In fact, I probably won't need any extra hands until the upper TC skins go on.