Perhaps the builders could also train as hunters? A tropical island has to have some type of wildlife that is moderately edible with this new concept of herbs and stews. It is true that once everything is built they are a lost child in their profession, what if they had another profession to train for that could continue long after the construction. I like the idea of hurricanes, floods, some sort of disaster to wipe out/ruin/damage existing buildings so that the builders are once again earning their coconuts to pay their union dues. Also agree that nursing moms can do plenty to occupy/teach the children during their nursing days. And would be really good if once taught, the children could pick mushrooms on their own. It gets really hectic with a full population island to keep tracking down them wandering kids to grab a mushroom before it poofs.