Is this is what you're talking about?
I don't see how you would be able to play chords on such a beast. I think I'd have to play it lieing flat in my lap or something. It looks to be a real back breaker. Also, what's with the two inputs. Are the pickups split to route the lower frequencies to a bass amp or something?
I'm rather ignorant to technique talk, does "double tapping" use both hands or something?