Today, 16:15
OK I've had a closer look. I think that the ground plane can be expanded a little without the effects being too obvious. When you expand by 200 or 250 (eg I took the single_2 groundplane out by 250 each dimension) then the changes start to look obvious. As Gecko says, the airfield layout texture and the actual vehicle pathways do not match and other facilities don't sit where planned for in the texture.
The advantage of increasing the groundplane by 100 or 150, is that when there are four aircraft sitting on the runway waiting to take off, they do not straggle back onto the nearby paddock, they stay on the area textured as runway. Some runway layouts the autogen trees are further away from the point of landing, which is also a good thing. Nothing worse than returning after a 90...