I've been following your blog with my rss reader. Y'all are really making some progress fast!
As for removing the interior panels, I plan to do that in my bus and then potentially reinstall them with better insulation. It really is a question of what is best for you though. Think about the potential problems that might show up behind there and whether it is worth the risk of leaving them there vs finding them and fixing them. If you have no reason to believe there's no problems there (and likely, there aren't), and you can live with the crappy stock insulation, then don't expend the effort. But, really, it is your call.
I suspect, since you went to the trouble of removing a bent panel on the exterior and having it redone, that you'd be a person that would want to remove the panels and put decent insulation inside. But, I'm just guessing.
Good luck, and keep up the good work!