Does anyone know if there is a clear path from the drivers side under the dash up to the area behind the head unit?

I don't have the nav system, and have installed my old mp3 head unit into the dash, and there seems to be a good amount of space back there. I'm looking to modify the dash kit my head unit is sitting in and would like to run some wire down to the obd-ii connector. Just wondering if anyone knows if there are any areas to stay away from, or whether there is even an easy to access path between the two points.

Thanks,
jeff.