Subject: Emergency info needed for new loopframe convert!!

My eldest son was over yesterday, rode Norine and now wants to start building
a loopframe, I quickly took him to the garage and started piling up parts for
him, I need some info on 16" rear wheels, I know many have done the
conversion, where do We get spokes and which rim do we use? Is it just a
standard 16" Harley rim?