After a little play with Unity, I realize that this is not good program for modelling.
I have luck to have fiancee who work with Google SketchUp, so She will be modelling for me.
I was very surprised how easy it is to import such model to Unity. You need to export it from SketchUp to Collada (DAE) format and simply drag file to Assets folder in Unity. Such imported model will not have material, and texture, so You have to copy textures from SketchUp project and drag them on the models in unity. This is how it looks: