Hi @Helen sorry about late reply, this project turned out impractible. It's not that heavy. The problem is, that it only holds 4 cards and is inflexible so you cannot sit on it in your back pocket. I'm writing it off as an expirment (: Thanks for commenting!
Maker, youtuber and woodworker. Watch me work wood in 24 frames per second: https://www.youtube.com/user/andii1701/videos