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I don't have this one myself but have toured it to think about what I'd do with it.
Personally I wouldn't subdivide with walls or doors.
It was a challenge but I did eventually figure out a design for Mathiison Manor which embraced the super open living Elder Scrolls elven architectural style. Whole top floor as bedroom with study and bathroom. Lower floor guest suites, crafting, dining.
And I figured I'd do something similar with EC if I ever bought it. Treating either the upper floor or basement as main bedroom.
I've decided to use wall as shown in picture. It's not even nearly style that suits in here, but I like it (don't mind other stuff in picture - work in progress).
They should add walls with arches in styles for all major cities, at least.
In the past I have used "Murkmire Wall, Stone" it's one of the closest in colouring but it's an odd shape to work with.
Some of the Deadlands structural furnishings might work the Archway and the Door are pretty nice.
Also if you wanted you could take a look at the Apocrypha structural items the stone ones might work..... I mean the book ones would work but might not fit your theme, all are quite dark!
When people say to me........
"You're going to regret that in the morning"
I sleep until midday cos I'm a problem solver!
Yes, I wish that we could get extra furnishings, especially structural furnishings, in the styles of the basegame as well as the chapters/DLCs up to Elsweyr — a lot of great Elsweyr furnishings, including structural, although we could really use the unique doors, walls, and roof structures (the pieces we have, while wonderful, are masonry and temple structures).
You can use 1 octagonal and 3 long dark Daedric platforms to make a wall with a Sunspire Trial achievement door in the middle - The SS doors are 100K gold at the achievement vendor when unlocked and well worth it.
One alternative would also be the really large crown store Aeylid doors but you would have to wait for them to rotate back into the crown store.