Aachen Cathedral, the topmost structure, shouldn't be used. Only the central octagon is Carolingian, but you can't see it here, because it's obscured by the later (14th C-20th C) additions.
Also, the straw (?) roofs of the frontal and central structures look quite dark; perhaps they could be made lighter?
The text on diet is interesting, the drawing of those buildings is even more interesting, but what I personally find most interesting, is the size of those animals in Carolingian times compared to now; it's something everyone should be reminded of from time to time; thanks for sharing!