I've modified Jenny's plan of the hall to show Garstan's changes. More or less. The curve of the hall is a little off since I'm not great with Paint and it's not necessarily to scale, but it shows the general idea.
Garstan's plan.
Nice to see you here, Formendacil. I'm sure Garstan will appreciate the advice of one of the Dwarves. Cunning folk with stone, I hear. 
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People assume that time is a strict progression of cause to effect. But actually, from a non-linear, non-subjective viewpoint, it's more like a big ball of wibbly-wobbly, timey-wimey... stuff.
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