I've been looking around trying to find a map resource, the best i've found is psypokes which only has dungeons, serebii's pokearth only has limited screenshots for hgss despite for some other games they have complete area maps, so really short of playing through and mapping as you go there aren't a lot of good options for mapping the overworld.
here is the psypokes link:
OK thanks!
sorry about the screenshots, the tileset isn't ready yet!