Acorn's mechanical designs are stored in onshape. https://cad.onshape.com/documents/96f5b83bdb2e3e2dbf393685
Acorn's mechanical designs are licensed with CERN-OHL-P. See LICENSE file for details.
For more information on Acorn see: http://community.twistedfields.com
For a free onshape account, make sure to sign up at the following link: https://www.onshape.com/en/products/free