Really great stuff!
Rendering does not have to be fixed point, I've thought up ways to do first person view, but it would require projecting each chunk onto a sphere and wouldnt work well for non convex chunks. Anyhow for now I have to pick my battles so only isometric at the moment :)
Come to think of it, a simcity + simtower combo game would be great. Zone out an area, then choose what goes in each building and slice away sections of buildings to watch the ants go about their business.