I think that anything that steps away from reliance on a textbook is beneficial for Ss.
Absolutely! I think it sounds like a great idea, although I definitely second the point of getting permission first, whether you are going to put it up on the web or not. In the UK, where I trained, regulations around filming, photographing and recording children are very strict. Not sure what it's like in Korea or elsewhere, but definitely worth finding out rather than risk a lawsuit.