See also NIST

On December 12, 2013 attorney William Pepper sent a letter to Mr. Todd J. Zinser, U.S. Department of Commerce, Office of Inspector General, presenting the drawings and a Technical discussion of the 2 key structural features that NIST omitted from its WTC 7 report called NCSTAR 1-9.  You can download the drawings and technical discussion from this page:

Technical Discussions