Building a Custom ROM based on newer Android version?

Hi everyone,
I'm considering building a new Custom ROM for my Teclast X98 Plus tablet to get new features and security updates.
However I've never done that before, but as there are other Custom ROMs I think it must be possible somehow
The Android version of the original firmware is 5.1, also Mireks ROM for the tablet is based on that and also the available Remix OS 2.0 I guess.

My question is: Do you think it is possible to build a mostly working ROM based on a newer version like Marshmallow, Nougat or even Oreo?
And is it possible to extract the proprietary blobs and drivers from an existing ROM and get them working on the newer Android?
I've seen that on other devices, but I don't know where they got the blobs and other stuff needed.

Any input would be appreciated

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