What a great idea to draw out imagination and articulation of ideas from young children!
In addition to exploring the making of the stones using local manufacturing processes and materials, would it be possible to also consider matching the icon with the tactility of the "stone"? E.g. a picture of "hay" would correspond to a "hay" like material.
I see that might cause more complications in the scaling up and reproduction of the kit, I am just wondering if it is possible to appeal to the touch/smell senses of the young children as their imagination is sparked by the icons they see.
I am very thankful for your project's highlight of the central and critical role that fathers, as head of the families, play in their families. In addition to reaching out to fathers on an individual basis, have you considered forming small network groups for fathers interested in stepping up to your call for more involvement? This could help boost motivation, confidence and accountablity, as well as relieve some pressure off the wives from having to urge their husbands to be involved.
I love your concept of the power of home. In terms of kids safety with strangers, grouping parents into one team sounds definitely worthwhile to explore. There could even be a rule that there must always be a "chaperoning" parent from the rest of the group present at the event in addition to the "hosting parent", who can also assist in helping ensure there is enough attention for the kids. New parents wishing to join existing teams should have to meet up with the team before joining.