Not sure where I got the idea that I had to have a Big Muff in a Boss enclosure. But here we are.
I wrote up a blog post about the process here with more pictures: http://www.super-freq.com/boss-muff/
The whole process was easier than I thought it would and cost less than I expected. It was definitely more expensive than using a 1590B and a blue 3PDT switch. I started with a used DS-1 and this supplied a lot parts.
For my next project I'm going to house the Boss DS-1 board in 125B enclosure!
(https://i.postimg.cc/SXQkxvXj/5-FF48-B82-6898-4-D83-BE35-D259036-ADCC4.jpg) (https://postimg.cc/SXQkxvXj)
(https://i.postimg.cc/jwmbvqMJ/C823790-F-A843-42-BE-9-C98-06-C517-B4-D9-A8.jpg) (https://postimg.cc/jwmbvqMJ)
(https://i.postimg.cc/vxndKRK2/D1-CAE56-C-4-A86-40-AE-843-A-1588-DFA4-F289.jpg) (https://postimg.cc/vxndKRK2)