Head to C:\Program Files (x86)\Steam\steamapps\workshop\content then locate RavenField, mine is 636480 (this could be yours).

Type '.rfc' into search and press 'ctrl+a ' then 'ctrl+c.' and get all your mods easily.

Now head to C:\Program Files (x86)\Steam\steamapps\common\Ravenfield\ravenfield_Data and create a new folder called 'mods'. Hit ctrl+v inside mods and you'll see all your .rfc files (the mods) are now inside.

Will I have to do this with every new mod?
Yes.

Some images and other stuff end up with the other .RFCs , do I delete them?
No, the game will detect if it needs it.

Will this ever be an automated proccess?
STEAM support have not given anyone a proper answer yet other than 'ask the dev' which they have no power.