Great map for video making, but as mentioned before the white lines on the floor are hard to key out. However for me, this wasnt a problem as I was doing still shots. If you are doing still shots, try spawning your car in the air and IMMEDIATELY pausing your game, to make sure that the suspension doesnt extend out :)
It is quite good to have a map like this, but the sense of a greenrom is that it makes color keying possible. However, the markings on the floor cannot be keyed ot, because they are white. Five stars if you could remove them or make them green.