Muffin and Mini-Muffin are fine projects to build all the known variations of the Big Muff(TM).
While the Muffin is ideal for a 1590B enclosure…
Please note that despite its size all resistors are 1/4 W size!
You are able to build a lot of different versions as shown here: http://juansolo.co.uk/stompage/Muffs.htm
New Mini Muffun layout V.1.1
old build instructions: