Well, i mean not the fassad of the entrance hall from the New-New-Reichskanzlei, instead the inside of it. I wonder how it would look like! It seams to be a large corridor with 2 column on every site every 2 meters. The entrance hall is a part of the 500 meters diplomat-way. Even in the "old" Reichs-Chancellery was such a way. Don't know exactly at the momet, it was 250 meters long i think.
Because im not an architect, i just can read the ground-plan to 30 %, sure not more.
Here are some pictures. The most importantly is the ground-plan (Grundriß).
Here we go:
If you not yet know this video, watch it: There you can see the "Portikus" of the entrance hall. http://www.youtube.com/watch?v=Q8I7CVU_VxY