Some more rationale to support working on Gower before Horpe:
-Having some new stone blocks that line up more closely with the new terrainsets. We've got to work out former eastern islands in Jungle biome, stormlands alt, dark red mountains, pink granite, grey sandstone etc.
-Gower is flatter terrain and mostly involves removing the old forest, without worrying so much about gradient masks and other tools that are invaluable for hills and mountains
-The Greenstone style easily morphs into South Cape style Jeff has been testing for, with a change in the materials of course.
-Gower has approximately the same amount of structures as Horpe so its not like its changing a larger area of the map into sand/placeholder terrain than working on Horpe.
Several of these arguments also work for Herston.