Refactor coming on nicely. I now have the map and the node contents rendering from the same component, and the modelling classes all working strictly in physics space (which I've decided is object space for this project). I've put in a simple "select to view" control method and it's now possible to "look inside" the nodes to see what's there.

It's a bit scrappy looking at this point, so no screenies yet, but very soon.