I finally figure out how to put in the 3rd floor....although at this point I know Im going to be rearranging the interior walls and I was clueless about how to make the roof...
I WAS CLUELESS ABOUT EVERYTHING!!
By the way.....the added portion on the 3rd floor back walls is heavy card board.
I love card board...and Ive made several miniatures using it...people are surprised when they find out its made from card board...lol