This is an interesting post. When I tried to research JavaScript 3D graphics capeabilites, all I found were some attempts to draw using div elements.
I will have to read through your post again (since it has a too much information for a quick scan!), but do you have any links to simple examples? I clicked on the 'here is a copy' link and found something that I did not know how to use. :)
How is the performance? (the 3D using div elements was unusable beyond a non-filled cube)
How is the cross browser support?
Thanks for your blog post about OperLazlo on my blog. If you get a chance, take a look at my survey of Ajax/Web Application technologies. There are several JavaScript libraries listed, and I would welcome informed input.