here are some diagrams about how I imagine the kde4 port's document should work like:
The "sources", dia files, are also there.
About the interface part I'm not very sure, these are just first stretches. I want to work on more documentation ; later on the bottom part of circuit / simulator. The next thing to do would be to refresh the architecture document to reflect the situation on 0.3.7 branch.
Any comments are welcome.