This part consist of only Bernays' Two Cylinder Steam Engine. So the parts are assembled. Thank you for your interest.
STL (Stereolithography, filesize: 3.66 MB), OBJ (OBJ, filesize: 8.18 MB), FBX (Autodesk FBX, filesize: 1.86 MB), STP (STEP, filesize: 1.51 MB)