I'm starting a banjo building project to convert an old cheap banjo into one for a child (10 or 11 year old girl). She desperately wants to learn to play. Can anyone tell me what an appropriate neck length would be? I've considered a piccolo banjo (about the same as a normal neck capoed at the fifth fret) or just making it somewhat shorter than normal (about 24" scale length). Also, should I use steel or nylon strings? It will be a five-string.