In this chapter, we created a second model and interior model and hotlinked the interior and shell models into each other. We attached Xrefs and created new composite types for our interior walls. We added doors to the interior walls and created three different window types for the exterior walls. Also, we set up the main structure of our layer combinations and majority of the views to be placed on sheets. In the next chapter, we will create our first custom object from the scratch and populate the model with various other objects.