There is a reason why the Crowther Audio hotcake ™ is around for more than 40 years (first build in 1976). The original pedal was designed to leave the undistorted component of the guitar sound unchanged while providing a nice fat mid-gain distortion sound without resorting to a treble cut circuit which will also affect the guitar tonality. Meaning, if you like the sound of your amplifier but want to push it harder, this will be the perfect project for you.
We recommend putting this particular build in front of your guitar amp, not in the effects loop.
Based on the 2003 version for a more glassier Fenderish character.
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum