This is a simple thing.... but versatile. Just a jfet boost into a Bazz/boost section. No brainer really.
It uses a 4 position rotary switch to give a wide variety of tones, from "boost" to "fuzz".
Low parts count, values aren't too critical, certainly there's some room for mods.
The schematic is self explanatory, so I didn't do a layout.
If you'd like to assist the "Boo-Teek" pedal companies out there, you can post a layout so that they'll be able to build and market it as well.*

Enjoy !
PS: The switch will pop a bit when turning. You could add a 1M to ground on either side of the switch if this bothers you.
PSS: BIG nod to Hemmo for the Bazz section.
*with a few notable exceptions (Catalinbread, Subdecay, and a few others actually know what they're doing !)