Sure, NOW brothers puts out a video on doing a roof. Oh well, their tutorial isn't quite the same situation we had and they welded rather than using adhesive. I think they HAD to weld the rear seam because they didn't do the full inner roof panel so there isn't access to the inside with that in place, so the rear cab seam gets welded closed. We discussed it and decided to stick with the original look rather than weld it and smooth it out.
There was also a patch panel someone made a while back, not sure if it's still available, but it basically removed the rear seam and replaced it with a radiused piece for a smoother look.
https://www.youtube.com/watch?v=S_0ImjRL6jI