Thanks everyone :)
Here you are "84n4n4"
http://bit.ly/RUrK96
Quick & dirty. But that should serve your purpose.
Should be pretty easy to gring the material with a machine. By hand, I don't know, you can try. Resistance actually depends on what type of printer you use. In the end, that's just plastic...
This mold works fine as a "front mount" but isn't really the best choice for "top" camera (don't know if I made myself clear...).
You can probably actually place it at the same place than the PhantomX official mount (on the lense).
Cheers,