Rehousing behringers is a pain in the ass. It takes a long time and is a lot of work to get them into smaller cases.
You could probably go to a 1590bb (120mm x 95mm) quite easily though. Major issue is desoldering the pots, which is no joke.
Then I did my Vibrato clone from them, I left the pots as they were as it was too hard to desolder them.
Even then, on a relatively simple pedal, I had to align and drill standoffs, desolder caps and put them on the other side of the PCB.
The easy part was just replacing the footswitch. For other models you might wanna true bypass them, which can be a further headache as you have to set the "flip flop" circuitry to always on, or randomly start cutting parts or traces.
For the work involved I wouldnt rehouse a behringer as the cost wouldnt be economical. You could just buy a backup for less...
It was a fun thing for me to do last xmas as a bit of a project but the risk vs reward sucks to do it for "profit"
im seem to recall having to cut the pcb down to size to fit in the 125b also.

