I launched a Kickstarter and it got succesfully funded in 3 days!
What does unlimited travel mean? I suppose a ticket is available only for a specific route, until you get off the bus. So the underground is per-trip... hmm. When I was in Madrid, I paid only at the entrance to the underground network and then could switch lines as much as I wanted until I got out again. Paying per trip in that maze sounds like a bad deal :(.