Archangels is probably one of the worst items in the game. I wouldn't bother with it.

Not horrible, but it could use a few modifications, namely the masteries you chose. If you're going to make someone a tank, wouldn't you use Defense masteries?

this isnt horrificly bad, but it is horrifcly meh.

I think everyone here is pretty much on the dot! Your runes aren't the best for being "tankier" as Morgana. And I surely would Rod of Ages. the catalyst of the protector gives you incredible lane sustainability.
Also, I would never get Frozen Heart AND Thornmail...those two items basically cancel eachother! Your just stacking mass armor at that point, and when someone gets Last Whisper, you drop like a rock. When you get Thornmail, it returns damage for how much they do. If their AD/second is slowed by Frozen Heart, it basically reduces the effectiveness of Thornmail
Frozen Heart also reduces their ATK speed even if they don't attack you, making it more beneficial to your team.

I see where you are going, I like the idea. I don't like the boots. And as Leona said, the runes are a bit funny. I feel you don't have enough content here, however your item section is very nice.

/thumbs up
In hope that you will change your build/runes maybe add content.

agreed Rod would help Baxxie XD do you go around telling everyone to buy a rod? (lols)

Here's how I'd do that;

Get Rod of the Ages over Archangel's.
Scratch off Rylai's, that is more health than you need.
Get armor seals.
Get mres or AP blues.
Change quints.
Get only one armor item( Frozen Heart, that is) and get a Rabadon's Deathcap.

No votes from me, sorry. Not upvote worthy to me, but a straigth good idea regardless.

I have several issues with this. Firstly, your rune selection seems off. Sure you want to be tanky, so shouldn't your glyphs be magic resist or even CDR? The Quints then can be used for things like AP or more HP, hell even swiftness quints.

Boot selection, I'll let slide. I'm not a fan of merc treads on morgana because honestly, cdr and magic penetration are just so much better. Morgana should not be leading the charge in a team fight, as well as morgana is only as good as the amount of skills she can throw out; your CDR comes late game. This is a VERY expensive build, and honestly, rylai's as the last item gives you NO hp to be an efficient tank. She is better off as an AP carry/ apcarry/support, not a tank.