Thanks!!
I did a quick try with according to your comments. Posted here.
But problems with water are due to a unsuccessful mask (painted shader).
It makes it opaque... but the roughness might come from the displacement tolerence, I went from .57 to .2
I'll run another render without the mask and with adjusted settings by Njeneb.
Not too sure what the god rays are?! a plugin?
Need to work on other stuff. Will be back at it tomorrow on TG2.
This image was a only a try out. The plan is to work on more tutorials and then compose my own idea project.
cheers,
f.
______________
still on MAC...

i'll do more tutorials and if i really need those plugins I'll switch.