The problem with Professor Hulsey’s investigation is that nearly all the building debris was disposed of years before either his investigation or the NIST investigation even began. It will never be possible to know if all the specified components were actually fitted, or whether substandard parts were substituted. Maybe he and his highly respectable team have been able to address some of this, but it seems unlikely that much can be proved conclusively.
WTC7 stood for many hours beyond its fire rating, everyone was evacuated and so no one was hurt or killed in the collapse. Consequently, investigation was of a much lower priority than the Twin Towers. In fact its collapse was a godsend to the fire-fighters, who wished to search for their comrades trapped in the wreckage of the Twin Towers.