@puybaret
>Is the green color outside the house comes from the ground color you set in 3D view modification dialog or is it a big "room" you draw around the house?

it's an ordinary grass green colour applied to the endless outside ground. so, there is no surrounding object around that house. sometimes i put some little invisible green blocks outside to "force" the flyover camera to a specific spot, but this should not cause problems.
greets
macfrog