thanks for all the comments.
I'll post some photos in a few weeks with the vehicles in place to get your opinions of whether it's too clutters or not.
I made the trees using the twisted wire technique which i think is well documented. I covered the wire with plaster of paris and, after it had hardened, used a sharp knife to make incisions to represent bark granularity, and then put several coast of well thinned oil paints. The plaster absorbs the paint nicely to create different shades of colour. The foliage started with some herb leaves glued to the branches to give depth and then covered with Woodland Scenics foliage. Its still a bit sparse so i'll add some more when its about finished. Thats stuff is expensive though, especially here in australia.
The road base is newspaper (to get a cambered shape) covered with plaster covered with actual and fake dirt. I then sprayed it in some areas to get a better colour representation. The newspaper allowed the road area to spring a little which caused the final surface to crack. I didn't intend for that to happen but it resulted in quite a realistic appearance so I ran with it.
Cheers