This video of the Dartmouth Hall renovation, just discovered, has apparently been up for a couple of months now. It shows site plans, floor plans, interior renderings, and several other views. (It also refers to the auditorium as “Dartmouth 105” instead of “105 Dartmouth,” which seems to be the older, more common phrasing.)
A couple of interior views also appear in a recent Dartmouth Alumni Magazine article. (Another aside: the 1773 Gamble plans and elevation drawing depict a large stone building that was not built.)
Neither this oblique view of the northwest corner of the building nor this straight-ahead view from the Green (both provided on the project page) indicates a railing along the front of the podium. There are short east-west railings lining the stairs, and there are substantial railings to keep people from falling off the north or south end of the podium, but there is nothing along the podium’s long west facade other than a low coping fronted by some ground plantings. Is that realistic?