pssstt....
Anyways; if it were my decision, I would ditch the sky island theme, even though it's really cool, and instead go for something like the picture above; somewhere where we can showcase our terraining skills while also making a great castle that has steampunk integrated into it.
It could be a castle ruin as well, with exposed machinery in the walls and other things like that.
The size of it would be large; but as you can see from the picture, the exterior is not that detailed yet still looks great. I think that the majority of the brickcount would go to the terrain/machinery and interior.
Another idea is to have machinery built into the terrain (For instance, in the canyon walls in the above picture.)
