"plastic drainage pipes, looks like part of a pipe-organ, played with rubber 'flyswats.' Not terribly portable!"

Aussie Lindsay Pollock (mentioned here before) is famous (or should that be infamous) in Australia for using 'weird shit' to make instruments, and carries one of those drainage pipe gizmos around with him to fairs, etc that is played with the sole pieces of rubber thongs - the Aussie description!

Just google him, you'll find out how to make a 'clari-carrot'...
He even plays a bicycle...