TogetherJ-like support? (class diagrams)

[danhaywood]

I originally got into Apache Isis by way of (the sadly departed) TogetherJ ... I'd coauthored a book on the topic over a decade ago [1]

So... this is a big ask, but it'd be wonderful to be able to enhance the Eclipse plugin to provide way to visualize a domain (or subset thereof) as a class diagram of some sort or other.

[1] http://www.amazon.co.uk/Better-Software-Faster-Coad-Carmichael/dp/0130087521