It wouldn't be hard at all.
It would be a little more work if it didn't fit in a 1 mile X 1 mile square!
Most of it would be a painted skin.
As for structures, we can only work with what we have.
I think the main reason that the original Fields are used is because they already have a Field Map Layout built into the game.
At the moment we can't add a Field Map Layout Bmp to our Terrains .res files. It would have to be a seperate file that players would need to find and download.
Would be nice if you could include stuff like this or even a Terrain Description file to give some information about the Terrain from the person who made the terrain.
Pokie