I would highly recommend adding Matrix to the mix - it's such a great pattern and I have it everywhere - dash, console, charger outlet, hell I'd put them on my wheels if I could.
As for suggestions for improvements, honestly I feel that you guys knocked this one out of the park. Only thing I could recommend is what I've already suggested - if there's a way to show exactly how much overhang your piece should have, that would be great to use as a reference the start of each piece.
Also, as you work with the pieces, you start to learn exactly which piece you want to be perfectly lined up with the edge of the chrome, or something that should be perfectly level because it will be visible - it might be a good idea to make note of those types of things in the install video.
I am 100% satisfied with this kit, and I'm amazed that I was able to do as good a job as I did. Like I said, the perfectionist with OCD at 1 foot will be able to see a few things that I could have done better, but that's a pretty high benchmark.
Honestly the seams don't bother me either. I'll be watching the seams over time to see how they fare with use and report back. That said, I've used 3M vinyl wrap for other things before and if that experience is any indication, I'm not too worried.