Miss Bamika Easterman suggested that this sim was worth a visit, and indeed it is a fine replica of the original fortress.
The sheer size makes it difficult to capture in a photograph - or in person.
I liked the texture of the causeway below and to the left of the abbey.
Of course, it replicates the modern fortress, as indicated by the car park. Ah well.
But I was actually a little confused when I arrived, as my memory told me I had already visited the sim many months ago. After a little searching, I realized my mistake: there are two versions of the fortress, and this one is the one I had been to previously. It was created by YadNi Monde, of Paris 1900 and YadNi's Junkyard fame.