I am starting this topic to keep the enclosure related info available.
For the pedalSHIELD UNO we have the Youtube video from the Make Magazine enclosure:
Doing rough measurements, a pedalSHIELD UNO goes fine into a Hammond 1590BS (which is similar to the classic 1590B but a bit deeper).
This is the best candidate that I found, unfortunately, the box is "too long" so it won't perfectly fit the board... part of the enclosure will be empty.