building 3d model*** use sketchup o import .dae and *.skp or use unity for import *.skp** don't use blender to import *.dae because of there is a bug when import to blender(i dont know what is it ) or you can try it(export from sketchup and import to blender).
SKP (Sketchup, filesize: 5.08 MB), DAE (Collada, filesize: 1.93 MB), TEXTURES (Textures, filesize: 185 KB)