No, I have no noob parts.
For 005/000 I only have a caseback, but it's HF, and definitely not the "best" one.
But you can refer to for example
Hazing, he tried to implement one project with 000, and As far as I remember, his assembly definitely has a good caseback from noob, which is better than the HF that I have, or any XF.
Even with a good caseback, you are no longer limited to 000/005 cases, but you can search for any 6834 noob case, such as from 390, and other models, or maybe even just 111 v4 or 5.
Yes, I started from the title "best" because I suggested to find what in my opinion is the best.
So yes, you can buy any XF 005 or 000, and rearrange all the GENs that you find, it will be simple and fast.
It's a matter of taste, but these models are so good at rep quality that I would only spend money on gen parts if the build ends up being a combination of the best, enough to wake up one day, and generally forget that it was a rep. lol.
Yes, noob parts are not common, because they are used for assemblies. How can a noob's case be freed? If someone replaced it with gen? Therefore, if I were you, I would be ready to just buy the whole donor watch.