Reproducing the tapered shaft and mounting the flywheel to it is probably my best option in this case. I will post a picture or two today of the flywheel so you can see why I want to preserve as much of the center as possible. In my opinion, it will give plenty of support and provide a mounting method. Resembling the largish prop driver from a Supertiger. This is the end result I want to accomplish. It has two webs inside of it which can be drilled for the magnet, or I can do the outer diameter like all commercially made hubs. I hope this works. I have a semi scale rough drawing of what I want it to look like which I will post also.

John