Was the Great Lodge supposed to have more stuff in it, other than the first floor, and Knut Whitbeards Loft?
Every floor is walkable (you can get up there with a loftwing).
Once on the second floor, you can walk all the way to Knuts loft, no NPCs are there thoug, and the doors that usually block the stairs to the loft is open.
If you look through the small windows to the stairway (that you can enter from the first floor, but that teleports you to the loft) from the second floor, you can see fully modeled staircase, leading up and down..
AND you can sit in Knut's throne, and that gives the Great Lodge Legend-Throne (part of the Chairs of the World achivement.
This makes me think that the great lodge was initially supposed to house way more stuff than it does.. Maybe even house all the crafting and vendors, before the full hoelbrak was thought up in its current form.
Screenshot of me sitting on Knut's throne xD
https://ibb.co/34VsPkD
