I have mine set to 0m...its not actually 0 but its as close as you can get using the free cam.
If you load up the minitweaker with the Cam tweak file and set the "TerrainColider Radius" to 0 you will get as close as you can get...AFAIK
Small tut on how to use the Minitweaker if you never did it before
http://www.subsim.com/radioroom/show...3&postcount=18
The links to the latest Cam Tweakfile and the minitweaker maybe someone could link to...can't seem to find them at the mo :p
You will still not be able to "fly around" on the deck and stuff but you will get closer then stock, thats for sure.