Can I use AutoCad for building meshes and such or am I stuck with Maya and that other 3D program?
You can use Autocad or Inventor to create meshes as long as as you save your mesh in iges format, then you can import it into MAX 5 texture it then save it as a ase file which you can then import into UED 3 as a static mesh but if you texture your mesh with a texture that is not an original texture be sure to import it into UED3 or you will have to rassign new textures to your mesh.