DJD, I think the hull is from Extreme and Weismann rigged it and used thier own drives.
What makes it special are that the engines are practically inline and the tranny makes the offset to the drives.
I know Mark built some Phantom hulls for Will Smith. I also know his 29 is tough to beat but the 39 has not been too successfull so far.
There are some great photos in Wiessman's site.