I want to construct the illusion from the Complete Course in Magic, but I need dimensions on the frame. Has anyone built this? Can anyone assist me?

PS. My square circle is coming along.. I will post pics when it is done.

Jim Gerrish describes how to work out the dimensions using PVC Pipe and connectors, then taking that model to an ironworker (or doing the ironwork yourtself). Since you already know the form you want and just need the dimensions, you don't need to buy the PVC Pipe e-Book, but just in case you want to explore other possibilities, it's in his PVC Pipe Illusion Book 3 and the article is called "PVC Pipe Levitations?" The question mark is there to alert you that there are very few levitations that can actually be made from PVC pipe, but that you mostly use it to create a template for building one out of metal.