Depending on what your budget is, you can get a case laser cut.
I think it can be done for around 90 USD including material.
DXF files for the individual layers can be found here:
https://github.com/bishboria/ErgoDoxIt can be a good idea to merge all of the layers into one file, as it will save a lot on the start up fees.
Some companies want svg files. Inkscape will work perfectly for this, just drag and drop, and turn of scaling.