Very cool. The rental part is less exciting to me, simply because I live in a more rural area. When it comes to P2P sharing, it's better to just have relationships with your neighbors and share/barter directly. That isn't to say I wouldn't use the rental feature. Just that the tutorial / diy "recipes" feature seems to have a more near-term usefulness to me, as it doesn't require proximal adoption.
I wish you luck!