This is a major achievement and one I have been eager to see for a while. It works well so far, and apart from interactivity bugs the only thing I can see as a bug is the center of mass for the new parts is off. My initial tests created exactly the combined parts I wanted, but I couldn't launch in a stable way because the 100 tonnes of parts had a COM about 50 meters above the actual part! It made for an entertaining launch, but not a part I can use yet. I hope to see updates in the coming weeks, this is a real game improver!
