I'm actually going to claim this "for Grandmas" bounty myself, on behalf of Monetas.
You're doing most of the hard work, I would agree with that, just willing if would be reasonable donating part of this to the bounty of Holy Grail development.
I'm recording an "advanced" video tonight and will post a link soon.
P.S. most of the code in this app is being re-used in the Android app as well as the "Holy Grail" project.
Looking forward.
Congratz again!