I have a project in which I am to create a model of my high school, inside and out, classrooms included. I expect it to take me quite a while, but for the time being, I am trying to create an emptied out, boxy outline of the shape of the building. However, do to many parts of it, both now and in the future, I need to fix the issues (a result of my carelessness and little actual skill) described in the title. What might be the best way to do this? There are many faces that I cannot even select.
The blend: http://www.pasteall.org/blend/25554