I use a 120GB OWC Mercury Elite Pro mini Portable SSD USB 3.0 + eSATA Storage Solution with a 918+ for the Core. No issues.
For anyone encountering this challenge, please refer to:
You’ll probably will run into some more peculiarities and overlooking the tiniest of details. Then, read on here:
Finalize visibility/usability of the new Volume by making it a Shared Folder.
Have fun!