You can purchase the base and the poles from any of the illusion builders if need be. Or you can build one yourself (Owen's plans are good). Peter's harness has a "standard" nipple to fit most poles.
I had several new poles done for mine (varying heights, finishes etc.) and several base gimmicks. These were done at a local machine shop. The base pieces were made to Owen plans.
Search the Café for input as there was a least one thread where the pipe material was discussed. (C.D. Seamless Mechanical Tubing 1015/1018)