That's what I did, too. I want to create a Pi 2 blade server and use it for local docker PaaS (for builds, running tests, etc.), but can't find a good case for that. The dog bone one takes too much space and is too generic.
I'm happy with it, and I can't really imagine a case being any smaller and still protecting the Pi while providing access to its various ports (including the SD card). I'm not really into the see-through case thing, but I couldn't find an opaque case I liked better for the same amount of money or less.
I mean something like this [0], but more efficient as you need an outer enclosure only. Blade-server like would be idea (where the Pis are vertical) with some more efficient Ethernet cabling to connect them to a switch.
I'm not sure whether it'd be appropriate for what you want, but this is the case I bought:
http://www.amazon.com/dp/B00ME5XUAG/
I'm happy with it, and I can't really imagine a case being any smaller and still protecting the Pi while providing access to its various ports (including the SD card). I'm not really into the see-through case thing, but I couldn't find an opaque case I liked better for the same amount of money or less.