Thanks for all your help guys. Well, I've managed to do something... it's not quite right yet, but I believe I may have forgotten something somewhere along the line.
The shot below shows it all.

I'm sure you can all see the problem, but as I said, have I forgotten something here? How do I stop the terrain from tiling, and how do I get the terrain to stick to the model? (The ground texture has been removed to help you see the problem more clearly.)
The shot below shows it all.

I'm sure you can all see the problem, but as I said, have I forgotten something here? How do I stop the terrain from tiling, and how do I get the terrain to stick to the model? (The ground texture has been removed to help you see the problem more clearly.)