Drop one of the fighting arts, add stick fighting and pistol shooting and make it the modern modern pentathalon....
I think it all sounds good in theory about kids, but my feeling is kids don't have the attention span, retention and discipline to train 4 arts at once.
Maybe judo for pee-wees, wrestling next ( more punishing holds), boxing third (before they can trash eachothers brains) and tae kwon do for teens, bringing the boxing in with some fancy footwork?
Guangzhou Pak Mei Kung Fu School, Sydney Australia,
Sifu Leung, Yuk Seng
Established 1989, Glebe Australia