Initial Idea

I have made some rough notes about an initial idea before we meet with the Scrapstore this Friday. My idea is to produce a filmed advert shot in a school of a chain reaction machine, inspired by a famous Honda advert, called a Rube Goldberg Machine. I have drawn out a rough plan of action for it:
I was thinking of contacting a local primary school and get permission to film for a morning there. I would then design and build the machine myself beforehand and introduce it to the kids, where they could add their ideas. During the shoot the kids will interact with the machine and hold up signs portraying the advert's key messages. I thought this is a good idea to carry the Scrapstore's message of inspiring creative and constructive play.