I'm new to this, but if I see something I think I can answer I'm glad to pipe in, plus I learn from teaching.
I'll be honest, I think I'm shooting for something like you say, not one tutorial, but different app tutorials as my knowledge grows. I'm targeting the beginner right now and utilizing all the information that's out there. Plus, I'm a beginner!
I really think staying within the group is important initially because of all the great information and utilities already in here, and I want to utilize all everyone has to offer. All the stuff you guys have done for instruction is awesome, there are some awesome tutorials out there, I think the power of the tutorial will be from using these already existing utilities.
I'm currently working on ascetics, and am working on keeping the apps size to a very minimum, using YouTube and browsers instead of embedding the files in the app. It would be nice to have all included, but that just does not seem viable with all the awesome info out there.
I'd love to collaborate,and will drop you an email. Thanks for the positive feedback!
My end goal is to produce an open source tutorial engine which anyone can download via the gallery and plug and play their own tutorials in, as well as produce some very nice tutorials for Beginner, Intermediate, and Advanced App Inventor 2 creators from existing information, something quality that a teacher can say download this app and a student is born..