@MrHipppo @Grandpa3DPrints Really appreciate the responses!
I did what I usually do, ask a question THEN do deeper research while waiting, and actually find an answer... Whoops! Could have saved us all the time to read my rambling and post here lol. ;)
as per ;
https://certificates.creativecommons.org/cccertedu/chapter/4-4-remixing-cc-licensed-work/
"Fundamental principle: As of Version 4.0, all CC licenses, even the NoDerivatives licenses, allow anyone to make an adaptation of a CC licensed work. The difference between the ND licenses and the other licenses is that if an adaptation of an ND-licensed work has been created, it cannot be shared with others. This allows, for example, an individual user to create adaptations of an ND licensed work. But ND does not allow the individual to share adaptations with the public."
And;
""General rules:
If the underlying work is licensed under a NoDerivatives license, you can make and use changes privately but you cannot share your adaptation with others, as discussed above.
If the underlying work is licensed under a ShareAlike license, then ShareAlike applies to your adaptation and you must license it under the same or a compatible license.
You need to consider license compatibility. License compatibility is the term used to address the issue of which types of licensed works can be adapted into a new work.
In all cases, you have to attribute the original work when you create an adaptation.""
The whole page is really interesting and worth a read. There is a big scope as the whether something becomes an "adaptation" of the original work or not to begin with. But the key here for me is that I am indeed allowed to modify, at the very least for my own personal use.
For anything under a Creative Commons license anyway...
Something there I'll have to read several times is how you go about remixing things that are under different licenses, together at once... Yeee Ikes.. lol.