I suspect they could put track in that area but not sure about station buildings and maintenance. i believe they are allowed to build 'run off track' like with thirteen but they aren't allowed to cut down many trees. I think it would be quite cool to have a ride racing through the woods at high speeds. Thirteen has an element of it put its a littlie slow, even if it feel fast. If thirteen feels fast imagine what a ride that's actually going quite fast would feel like.
In the other areas of the woods nearer the valley I'm not really sure what they're allowed to build. Obviously they can't build in the gardens and I imagine they have to be very careful about chopping down trees in that area but as @rob666 has said there are area's that track could be squeezed in without needing to chop down many if any trees.
In the other areas of the woods nearer the valley I'm not really sure what they're allowed to build. Obviously they can't build in the gardens and I imagine they have to be very careful about chopping down trees in that area but as @rob666 has said there are area's that track could be squeezed in without needing to chop down many if any trees.