The casing STL files can now be found under:
System reproduction
The casing is 1.5[mm] thick all around.
The outer dimensions of the casing are 23.2x31x13.5[mm].
The casing has a snap fit solution and does not require any screws or similar. This far, we have had the casings printed on a MakerBot 2 by myobjectify.com.