DreamsOfA47, I'd suggest starting a new thread, maybe "Type 47 Rear Suspension", include whatever links you have already found, and see who replies.
I've never really studied the 47 suspension. But I bet it would be interesting. There are a couple of 47 owners here who might be more likely to jump into the discussion with a topic title more specific than this one.
And, welcome to the forum! I saw and decided to get an Europa when I was 16 and drooled over one in a car magazine. Then I forgot about it, bought one when I was ~40, and only later remembered my 16 year old lust.