Cheers Gen - Really helped alot - But this process still is very confusing.

Saving the images out as EXR has let me play with the files in Photoshop

I did also find that there is a view transform option in the Arnold view port and setting that to "Raw" instead of Gamma2.2 gives me the same look as the saved files and there is also an option to save the images as Color corrected. None of this is remotely explained anywhere in the number of tutorials I have seen.

I just hoping this does not blow up in my face once I get some textures on it.

But really grateful I have a workaround for it now - Cheers.

Here are some renders of just the shadders

Ver 01



Ver 02