Dear pe-zulu
I never listened to Rübsam on the piano, but I have known people who did and liked it very much. It seems that he is full of passion. Or so I heard.
Music and architecture. No, I really cannot understand the connection. I thought I found it yesterday, in book painting.
But I explained it today to a young friend (she sang Machault) and she seemed quite unconvinced...
But I am working on it. By the way, I can listen to nothing but Machault, these days. I am becoming totally obsessed with his odd music making... It has a kind of magic that draws me into it. I can't understand it really well. It is so different from Dufaÿ's music... [by the way, that is why I did not listen to Walcha's doric fugue yet - I do apologize, but I seem to be mesmerized by Machault.
I don't think there is a way of uploading images, otherwise I'd try to explain what connection I think I found. I even found (did I ???) a kind of pictoric equivalent to the hoquetus.
I think you are quite right on the question of the non-legato. I explained my opinion at some length (that's a huge understantment!) above.