Diamond DA 40 3D model is available on CGTrader for $69. Original author: john-macneill. Specs: 56706 polys, 30158 verts.
LWO (Lightwave, filesize: 6.47 MB), OBJ (OBJ, filesize: 8.72 MB), FBX (Autodesk FBX, filesize: 8.82 MB), 3DS (3D Studio, filesize: 6.41 MB)