Paul Birch and Mass Stream applications for the real world

[omega_tyrant]

I have been spending some time reading through Birch's materials. I think his ideas about Mass Stream, orbital rings, etc, are very good, and don't appear to violate any laws of physics (although I'm not a scientist, so I don't know for sure.) It also doesn't appear to require any radical breakthrough tech that is not already in existence to produce. What do you think is the main reason why we don't have practical Mass Stream tech? What are the biggest obstacles that are preventing our adaptation of this tech?

Curiously, I also don't really see this tech being discussed, either in scientific circles or in sci-fi.