You like it rough and unpolished without getting noisy? The tone conqueror is a gated Fuzzstortion for your Doom needs and has it’s roots in the Way Huge Conquistador ™. Fairly simple to build but does hard things to your tone. Personally, I liked it even better when the front was hit by a boost pedal to make the effect even more intense. So you may want to keep that in mind when building it and may put it all in one enclosure.
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum