Looking really sweet!
The only problem is that the first point seems like it should be the second point if you look at the detailing, due to the wood textures being at B and concrete textures being at A. It makes it feel more natural in a sense for level progression. You'd expect to have more solid textures (such as concrete) as you penetrate deeper into enemy territory, instead of wood. It would immerse the player more into your level, just adding that extra.... Wow factor to make the final point seem more epic, instead of an older building of lesser importance than the big concrete building that contains the A point. You know what I mean?