Transformation map

I’ve looked through the samples but can’t find anything similar, so thought I’d ask here. Has anyone produced something similar to the below diagram? Ideally each section (year and category) would be a group and I could new years and categories which would re-arrange the diagram so associated items stayed in the right section

This is much like the http://gojs.net/latest/extensions/TableLayout.html sample, except that the rows and columns are curved to go diagonally.

We don’t have any existing sample like that. Although I think you could adapt the TableLayout extension, it would not be easy. What happens when there are a lot of nodes that belong to “Organizational / Structure” in 2012?