Hi all, DualJoe's 'buddy' here...
Once every few days I do some testing on DualJoe's Grebbeberg 'island'... Starting with a raw heightmap with a sat image projected, it's slowly getting to a really promising project. As said, the 1:1 scale feels a little odd at first glance, but I think it is the only way to go when modelling for a real world area.
Almost every evening I speak to DualJoe about his project to inform him about bugs, performance, etc. I'm a little surprised by the overall positive feedback here in this topic. I'm looking forward to the public release... Here are some screens (not the best ones, I know...) of the current w.i.p.