I really liked the red and blue one when it came up for sale a number of years ago, but I needed another boat like... It looked nice. I never saw it in person.
They were Eliminator Spiders, and you're correct Biesemeyer bottom and Sanger deck. I have no idea how many were built, but there aren't many around that I know of. Phil Gould had one, and sold it. Jack Landers had one and crashed it. Dave Noyes has one. That's all I know.