I have a draft at the 10% scale currently being finished. The roads I had set to import as cobblestone, but instead they came out as snow. I'm manually fixing this in Creative. I will not, however, be cleaning up other edges, nor will I be adding the buildings and such to towns - 10% scale is too small for faithful recreations.
I have, in the last few days, managed to get a 20% scale map that would not break the heightmapper. The heightmap I'm using did not scale up appropriately, however, so I will need to do a great deal of trial and error to have the terrain actually match up to Dereth. This will be quite time consuming: Each draft import of the 10% took roughly 1-2 hours. The single draft of the 20% took 11 hours to convert.
The 20% scale map appears to be large enough that cities could be rebuilt with acceptable accuracy.
Once I have finished fixing up the roads, I will update this post with a download link for the 10% scale map.
I will also attach my recreations of Dryreach [one is scaled to player height, the other such that the buildings are sized proportionately to one another].
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"Holy Crap, it's The Dark Descending." - -My_Odins_On_Fire-