Get cured, becomee one after. You can start the questline as a vampire, only at the base stag though

It's doable. Isran forces a cure on you only after you recruit Sorine and Gunmar. After that, you can either get lucky with the vampires in Forebear's Holdout or let Serana bite you before going into the Soulcairn. If you're worried about roleplaying, I can help with that. I am currently playing this character in ESO and I can't get vampirism until later in the game. Therefore I roleplay that when the time comes, my character will choose to become a vampire because the disease acts as a constant reminder of why unholy scum needs to be purged from Tamriel. It's the cross she needs to bear.

Have fun!

I like the build, but I'm kind of worried about the 0 AR. 

Are you kidding?  On adept difficulty, I felt obligated not to perk any flesh spells because she is too overpowered and tank-ish. Watch the video in the gameplay section. I kill a draugr murder boss ebony archer with no problem. Of course, on master difficulty things change and a couple flesh spells are required in the early stages of the playthrough. Still, to my knowledge, this is one of the most tanky-est pure mages on the site... without sacrificing any firepower. But hey, don't believe me, give it a try, see for yourself. 

Honestly one of my favorite character builds - never played it - but the presentation and professionalism you guys show on this piece of Skyrim-art is honestly amazing O.o (Nerdgasm)

[blockquote][b][url=/profile/TheLibrarian]BlueDremora[/url] said:[/b]

Honestly one of my favorite character builds - never played it - but the presentation and professionalism you guys show on this piece of Skyrim-art is honestly amazing O.o (Nerdgasm)

[/blockquote] There's nothing proffesional, just a lot of passion involved. Thank you! :D