This is a panel for the Jurgen Haible Frequency Shifter, which is available as a PCB here. MW member Pix provided the attached images of his build.
Elektron Devices can be mounted in a two-tier setup, and I designed the following case. The design file is built for Ponoko. Shipping is a little pricey, but free above a certain threshold, so building this in acrylic and some panels in delsin (like the above FS-1a from Pix) would make a lot of sense.