Too bad those aren't on the LDS site. I really dig the 6-string J thing too ! Never believed I'd play 6'ers, chords, etc. but the 6-string has really opened up theory for me and allowed me to fill space more creatively in duos/trios and when jamming. And best of all I'm constantly enthused for playing it, and after a lot of varied gigs still feel it lacks nothing.
Unlike the Ateliers, my LEJs don't weight 14 lbs ! Maybe 9.5 for the spalt burst, and 10 or 10.5 for the black one but that's with a brass bridge and heavy knobs so you could knock a pound off that weight using an aluminum bridge and knobs easily. He had one 6'er, basswood body I think, that was around 8 lbs.
Hotwire makes 6-string J's too. I think you'd dig those, in a Celinder kinda way.
Brian is certainly easy to deal with. I've done ... 4 or 5 big (over $1000) international exchanges of $/gear now and have had no concerns. He deals a lot with Europe too, for those that don't know - not all shops are easy to deal with internationally, so that's a big factor for some including me.
I've had the pleasure of dinner with the guy, and he's cool but not trying to be liked. He marches to his own beat, works long hours to grow his business, gets any issues worked-out, and I respect all that.
With nickels, especially older ones, in passive mode with tone rolled off (passive tone rolloff works in active mode too, for those that didn't know), I can cop a decent non-modern vibe easily enough. Right hand closer to the neck, left hand muting, and if I'm doing Motown or Queen it sounds correct in the mix. I used passive my whole last gig actually, mostly because it worked better with the input on my Scout (KJung's old combo, heh) and the tunes didn't need any EQing that day.
Anyway, it's not limited to new-school tones any more than the player allows it to be, IMO. That's not to say it's the same as a P with flats, but just saying that where there's a will there's a way and it ain't tough to do.
The playing style and gear factor a fair bit, as always. Personally I sound nothing like the awesome player (and tone) in that PhatHatBand link -
http://www.youtube.com/user/phathatband
Post a pic of yours? I think he is doing P/J configs now.