I've never been one to mind having a full favourites menu... I like to hotkey stuff then remove it from the favourites menu so that's two down... I basically always had Slow Time on my bumper and only changed it when I felt like I needed Frost Breath or wanted to do Immortality... You'll get used to it eventually, and remove stuff that isn't necessary to always have on your favourites.

OP, could you please tell me what is recommended do to the first 15 lvls? What to prioritize during combat, what quests to take and not to take, when to get vampirism?

I love the build and I want to get the most out of it. I have my Orc ready and waiting just outside Helgen to start :D

In addition to that: How do I prioritize alchemy/enchanting? Just try to level it up as I go, or do I power lvl it as soon as possible? Or at a certain level? (Can add that I have never ever gotten myself to 100 alch on any character, but this is going to be the first time)

Sorry about taking so long to respond, didn't see this. For enchanting, power levelling at certain points whenever I thought necessary - this skill kinda took the backseat, until I thought I needed more of it. Alchemy just levelled gradually for me, though it can be power levelled very easily with Hearthfire. Just grow the three most profitable ingredients (I think Creep Cluster, Scaly Pholiata and Mora Tapinella, though don't quote me on that - you may need to google this) and craft the potion from them, then simply replant, wait and repeat.

For priorities, the major skills will get you by in combat, with some Alteration/Restoration thrown in there for defensive stuff. Those two are particularly important, and Restoration is worth training whenever you can (I just paid for training with the money made from crafting potions) to get Necromage, and Alteration as a secondary target for Stability. I managed to get both around the level 20s, and from there use Warp to make the most out of combat. I got Vampirism as soon as I got Necromage, though you could get it before if you want. 

For the first fifteen levels, just focus on Two Handed and Destruction (damage), Conjuration (this was basically my defence, I used minions to distract enemies while I did damage), and Restoration/Alteration with training from Collete/Tolfdir in the background. You'll also want to prioritise first completing Dragon Rising, then getting all three words of Slow Time and killing enough dragons to unlock all three words. Also, grab an Amulet of Talos and keep that Blessing of Talos active all the time.

I hope this covers everything, please keep me updated on how your playthrough goes and let me know if you have any more questions!

One more question, my good fellow!

At what level do you feel that this build is "complete"? 

I felt it was "complete" for the perkspread level - that gives people what I see as the White Walker in its entirety, at its most powerful. However, as you can tell from the perkspread, some ranks of perks are missing, so if you really wanted the fully "complete" version you'd probably want to fill those out, and maybe invest in Alchemy a little more. On the other hand, it could be seen as complete the moment you can do a Warp. That is the key move of the build, and what this build is based on. The moment you can do a Warp you're set, and the rest is just building up a powerful character around it.

Absolutely amazing my friend.

Build Restoration: Complete!

Bagged and tagged!