"Man is the most insane species. He worships an invisible god and destroys a visible nature. Unaware that this nature he's destroying is this god he's worshipping." - Hubert Reeves
I made a couple of slightly modified clones back in the day and called them the "dark horse" (s)... the super-fuzz is a weird beast with a slight octave up and that fixed tonestack that scoops the mids... Keeley's Fuzz Head is actually schematically in the ball park (minus the tone-stack plus diode options...)
Oh yeah, I forgot, it also goes by another name; the "Acetone FuzzMaster" the fixed tone stack (in both) is identical to the silicon shin-ei fuzz, which I think was made famous more recently (not that recently) by Radiohead amongst others...
You guys have to check out the Wattson pedals. They do the most highly praised clone of the Shin-Ei fuzz. Their FY-6 is a direct clone, and their EFY-6 allows you to dial out the octave, to make chords sound less slushy. They're extremely hard to find in stock though.