Any suggestions?
I am searching for a nice box that can hold both the Arduino and the shield, preferably with proper holes for the connections.
…or an Expression pedal that could have it all inside?
… sort of like the example here:
http://wiki.moddevices.com/wiki/Arduino_Case:_Expression_Pedal
Take a look here. It’s a little too big for just the Arduino&Shield but it really shouldn’t be much smaller imho.
If that would be sth for you, i can look up what kind of enclosure this is (i guess hammond).
Drilled/Filed all the holes myself, a bit of a pain in the ***, but still doable for a novice.
Yes, that is nice!
I am not sure I’m on your level of DIY, though… 
i also thought about putting the arduino&shield inside a exp-pedal, first, but i didn’t finde one that had enough room inside. Especially the RJ45 sockets make it hard to fit the shield in a tight space.
edit: also look, what jesse did (blog). Much easier to craft than my device. I would recommend this approach anyway - my first design was in a cardboard-box.
Yes, it will probably make the pedal big and clumsy.
I am following Jesse’s blog.
It works great, maybe thats the best approach.