It's worth checking out:
http://greenboy.us/
He has a forum at his site that's worth visiting, though you have to sign up in order to lurk.
Story: TB'er
greenboy created a series of high performance lightweight speaker designs that revolve around the new "super" woofers plus midrange / tweeter and crossovers. You can build from his plans, buy kits of pre-cut parts from Speaker Hardware, or finished cabs from a number of small custom builders. He calls these "fearful."
He has also created a series of designs called "fearless" that are only available through his approved builders. I think the switch from open to proprietary designs had to do with one or more commercial builders taking advantage of his name and designs.
I'd say the main deciding point between fEARful and fEARless is whether you want to build one yourself, or have one built. I think that if I needed that much sound, I'd build a fEARful without hesitation, but for my playing at lower volumes I'm satisfied with a couple of more compact speakers that I designed myself.