I was thinking about getting bigger amounts of iron and then build a bigger house with stone floor between the trees in the mistlands. this could result in alot of work, but the result could be interesting.
I'm still a little concerned here, because of the future inhabitants of the biome, but as far as I got it, thats still far down the road.

I stepped back from my (and my friends) old plans of a big castle because of the performance issues caused by terraforming. Combined with the other requirements (access to multiple biomes close by, harbor) its difficult to find a fitting building spot.