Caproni Ca-135 bis 3D model is available on CGTrader for $79. Original author: chipbasschao. Specs: 79233 polys, 51809 verts.
STL (Stereolithography, filesize: 19.4 MB), OBJ (OBJ, filesize: 19.4 MB), 3DS (3D Studio, filesize: 19.4 MB), C4D (Cinema 4D, filesize: 19.4 MB), DAE (Collada, filesize: 19.4 MB), FBX (Autodesk FBX, filesize: 19.4 MB), LWO (Lightwave, filesize: 19.4 MB)