Without official plans all that is a waste of time.
The debunker you link to is clueless and simply makes a complicated mess trying to decieve, misinterpret the 9-11 images.
That does not get rid of the fact that butt plates shown on the tops of vertical steel in the core prove they are not core columns. Core columns must have a 100% butt weld, like this shown on an "I" beam.
Butt plates ANYWHERE in the core area disproves the notion of "core columns". The complete lack of diagonal bracing disproves steel core columns. The complete lack of gusset plates at the joints of horizontal and vertical members disproves the steel core column lie.
Since butt plates are weak, and diagonals are never seen, steel core columns are an impossibility.
What can only be concrete IS seen.
BTW, the horizontal braces cast intot he core connecting the elevator guide rail supports to the interior box columns were all sheared off by the hundred thousand tons of crashing steel. And I would imagin that the core is about full of stuff so hallways will not pass light.
In this image the 2 dark vertical slots are the WTC 2 hallways in the concrete core. See at 9 seconds.
[ame=http://www.youtube.com/watch?v=zhNd48qx684&feature=related]YouTube - WTC 2 collapse from the south, street level[/ame]