I just finished this clone of a Katzenkönig by Catalinbread Effects
(https://i.postimg.cc/DJGMh3y7/IMG-6027.jpg) (https://postimg.cc/DJGMh3y7)
This is a fantastic pedal. Fuzzier than a Rat, more raspy and gritty than a Fuzz. which... is kinda the point, so I say they nailed it.
The controls are super interactive. in some situations the Gain knob seems to do nothing, but if another knob is turned way down, the gain has amazing effects. Exact same can be said for the Input. Soooo many tones. I'm only beginning to uncover the versatility of this pedal but it is definitely the missing link between fuzz and OD I've been looking for.
Used this build plan:
https://tagboardeffects.blogspot.com/2017/05/catalinbread-katzenkonig.html