felroki made a really nice overhaul for Windhelm's Grey Quarter and I thought it was a real shame it has never been ported to the Special Edition.  Well Now it has.  The original:
Fine Goods from Morrowind_The Gray Quarter - Dragonborn

Disclaimer
I have tried repeatedly over the years to Contact felroki directly without success.  Since no perms are specified, I am going ahead and bringing this port to the Special Edition of Skyrim.  Should felroki ever wish to take ownership or delete this mod, I will do so immediately, or felroki can do so themselves as they have mod and page rights to edit this version.  This mod still belongs to, and is owned by felroki,
My goal here isn't to take any credit for this mod, but simply to extend the life of a beautiful piece of felroki's work.   Since it was last published in May of 2014, I optimized the meshes to work in SE, cleaned the mod with Xedit, and fixed a deleted navmesh.  I also resaved it in the CK to bring it up to todays standards.

A short note from felroki: Thank you Sattyre for your hard work cleaning up and adapting the mod in my absence, and kindly taking such good care of it :) You have my full permission of course. And thank you so much all of you guys for
still enjoying and downloading it! Please enjoy!

Here are the many changes that this mod does:

THE CORNER CLUB - The Gray Quarter has put every effort together to create one little
corner of Skyrim feel like home. The furniture is shiny and new, but
modelled after the ones they craft in Morrowind, and praises the work of
immigrant carpenters. Every surplus banner and rug from the family
collections ended up here. Decorative braziers heat the freezing
Windhelm air and fill it with thick smoke. Unless you are a Dunmer
yourself, better prepare your lungs - this is not Kyne's fresh air from
High Hrothgar! The Dunmer of Windhelm no longer seek anyone's approval
but their own. Remember: you can get in, if you CAN get in. Decoration
aside, Ambarys has renewed some long-lost connections from the homeland
and thanks to them, he will now stock an amount of Morrowind food that
may largely vary between 3 and 15 food items or beverages (each).

SADRI'S USED WARES - The interior of this shop has been vastly redecorated as
well, so that you can really feel like you've just bought some shit from
the thrift shop, whenever you visit. Other than whatever he normally
sells, he is now
10% likely to sell 1-2 spell tomes,
50% likely to sell 1-3 pieces of enchanted weapons, 1-5 pieces of unenchanted
clothes or weapons, 1-10 potions and 1-30 ingredients,
75% likely to sell 1-12 pieces of crafting material and 1-20 books,
and will always sell 2 pieces of Dunmeri clothing.

THE ROOFTOPS - An area which had not been used before is now open for the
public to access - if they dare. The following furniture has been added:
~ a Cooking Pot
~ a Cooking Spit
~ a Wood Chopping Block
~ a bedroll for anyone to use
~ quite a few places to sit.

DUNMER HOMES - The interiors of Dunmeri houses are modestly decorated with as
little as they managed to save from the home country. Just like their
inhabitants, they stand tattered and weather-worn, but proud, clinging
onto what is left - a memory of old glory.

THE DUNMER OF WINDHELM - Certain characters now decide to express their culture by
their clothing as a form of silent resistance in oppression.

THE STREETS - The Dunmer have been having problems with keeping the streets
clean, especially since some vagrants started to deliberately litter
the place. If you decide to help them clean, no one will give you a
sweetroll; however, doing such a selfless good deed is a reward on its
own. (And you can never know what you might end up finding. One mer's
trash is another man's comeup...)

THE GUESTBOOK - It lays on a table in the Cornerclub. Don't forget to sign it!

KNOWN ISSUES
~ You should know that during the making of this mod, a gratuitous amount of mead has been consumed (no, I really mean it); if
there is anything off, you'll know which Daedric Prince to blame.
~ I very strongly do not recommend harvesting the plants on the streets.
Even though it is not visibly marked in the game for ownership, the
inhabitants will take offense, and the Nord guards, who care so little
about the life of their fellow citizens, will suddenly seem very
sensitive about the plants they raise in front of their homes. It is all
quite strange, but the Gray Quarter is indeed a strange place, playing
by its own rules.
~ If you wish to remove one of the Scathecraw buckets, you can try but you will find they are nailed onto the surface
below them and cannot be moved.
~ In the Cornerclub's food storage room, the pile of Ash Hopper Legs sometimes decide to hop out of their
proper place and I have given up to try to keep order among them.
~ If you walk the rooftops, know that you tread on grounds that were
originally not intended to walk on. Some odd behaviours like standing
"above" ground floating, or clipping into it are bound to happen, but so
far I had no experience of followers getting stuck or any other issue
that was not purely cosmetic. Odd clippings are especially due in the
rooftops of the central area; to be on the safe side, your followers
even in spite of having seen some shit will find it way too risky and
dangerous to follow you there. Because you are the Dragonborn and you
have no fear of dead wood, you are welcome to explore it however; your
ankles might sink into the pile of planks, but they will not crack under
your feet (I've tested). Quite a few small surprises were left there to
discover as well.
~ There is one more minor issue relating to the central rooftops; some of the items are placed there are not visible
from all angles, and you might see their shadows at first before the
actual items would come to your sight. I think this has something to do
with the odd meshes on the rooftop and therefore is out of my power to
fix. Krosis.