steel frame carport 3D model is available on CGTrader for $5. Original author: ahammodullah. Specs: 8190 polys, 8328 verts.
OBJ (OBJ, filesize: 1.39 MB), BLEND (Blender, filesize: 461 KB), MA (Autodesk Maya, filesize: 2.48 MB), FBX (Autodesk FBX, filesize: 546 KB), BIP (KeyShot, filesize: 17.3 MB), SPP (Substance Painter, filesize: 27.7 MB)