Emanating Fist XB-70

The XB-70 is a clone of the Captain's personal '77(?) Guild Foxy Lady, which were built by Electro Harmonix and generally very similar to Ram's Head Big Muffs. In the Captain's own words, "It sounds like torn leather soaked in piss and salt smushed lovingly into ears... It is a brute of a pedal, has a really intense roar at full tilt, like any good Big Muff really." I used my old Ram's Head layout as the starting point, but altered the pot placement and it should be a nice fit in a 125B now.

Electro Harmonix Ram's Head Big Muff

There are a lot of versions and subversions of the Big Muff. Many consider the Violet Ram's Head to be the best, though many consider the Triangle, or IC, or Green Russian, etc. the best. YMMV

This one has the pots hard mounted to the board, though depending on the enclosure you use, it may be best to wire them off-board. This layout is heavily inspired by the original Ram's Head circuit board, just resized for more typical sized components. I've also added a polarity protection diode, power filtering cap, and an LED resistor.

EHX also used this same circuit for the Guild Foxey Lady (3-knob) as well as several other OEM pedals EHX produced. 

EHX Axis Fuzz/Guild Foxey Lady

Before Electro Harmonix made the Big Muff there was the Axis Fuzz. These were the same as the 2-knob Foxey Lady fuzz EHX made for Guild. Most schematics on the web say 100k pots for both fuzz and volume controls, but the unit Ron (theehman) over on the DIY Stomboxes forum traced used a B1M for fuzz and a A500k for volume. So if 100k doesn't sound right, try those out. For Q1 and 2, the originals had 2N5133s, so try 2N3904 or 2N5088s.

Here's a demo video of an original Foxey Lady: