When I saw the title, the first thought that popped into my head was oh God, painting on leather is not easy. I'm not an artist but I know leather and paint and I guessed you need several layers of coat to prepare the leather for painting.
I remember a post of yours from the beginning of the year, when you were looking for a wheelchair for your project. You didn't say what it was but here it is now, revealed.
I think it's a good idea, unique and with a message as well I believe. I guess you're going to paint the kid mannequin as well 🤔