EDIT: I have tweaked several sections, and I think the terrain overlapping into multiple sections does wonders to get rid of the artificial "boxy" border effect.
After edit: I think the terrain overlapping into different sections looks better.
All in all though, it gives a rough idea of the main terrain features. At some point, either to the north or to the south, I'll make the coastline take a radical turn inward (eastward) to shake things up a bit. But that's a way's off time-wise. The 24-mile-per-hex map now covers over 600,000 square miles, about the size of Alaska or Mongolia. More than enough to start, and there are far more important things to work on.
But this was a good, or at least satisfying, exercise for today.