The solar panels need another texture,
your skybox is really, really unrealistic,
the texture you used on the pipes (the red one) needs to have better smoothing groups or just change it...
(http://developer.valvesoftware.com/wiki ... ups_Dialog)
the mountain in your 3D skybox isn't aligned as it should be;
[Blocked Image: http://www.cubeupload.com/files/4ff290doesnttile.jpg]
Apart from those details your map looks good ![]()