I love this idea and I'm already picturing a mashup of LabVIEW class hierarchy/VI call hierarchies but it's dwarf fortress with multiple z-level view enabled and you can mousewheel up and down through the pyramid of the application architecture. I'm just lost as to how you'd relate/visualize the dynamic instances of classes/modules so that you could have a unified debugging environment, like you do with the regular block diagrams.

I've recently debugged LabVIEW code that resulted in the taskbar listing of windows names to overflow. Definitely less than optimal.