Problems:
As soon as you hit lvl 6 and start ganking other lanes, the enemy top laners going to do the same thing. And if he doesnt do it the first time you gank a lane, he will the 2nd.
Before level 6, the fact that you have literally no armor items means youre going to get destroyed in lane. No Glacial shroud?
Ninja Tabi> CDR boots. Especially because you dont need the early CDR, because you cant spam tremors and leave lane to gank unless the enemy top is comeptely stupid.
Also I dont know a lot about items on Rammus but I dont think anyone has ever run SV->RoA\
->Thornmail in the history of the game.

Ok. I'll play you anytime. Add me.

You say that as if 1v1 means a ******* thing in League.

OH my god, I haven't heard the word "Jank" in the longest time. please take my reps

I'm not saying you don't know how to play him, I'm saying you don't know the optimal way to build him.

If you think that I don't know how to play a Flash- Teleport- Sunfire Aegis- Rammus you are wrong. I think Ghost- Homeguard- Thornmail is twice as good and I dare you to face me in the top lane if you disagree.

Jank everything, Jank runes, jank items, no sunfire cape, -1

What's with the cdr spam

Now that I look over the cheat sheet, it really is pretty bad. I have no idea what made you think taking so many CDR runes was a good idea when you can take Frozen Heart and Spirit Visage plus the masteries to get all you need. Additionally, Rod of Ages sucks, Ionian Boots of Lucidity suck, early Enchantment: Homeguard isn't a very good idea when you can get another item, Ghost sucks, Barrier sucks.

You don't want to be comparing Thornmail to Sunfire Aegis. I consider both items core for Rammus. You should, however, be questioning the Rod of Ages. I really can't see why I would prefer it over a sunfire.

Also, rammus wants flash. Rammus top is best with Flash + Teleport. Flash+taunt is one of the strongest moves in the game, and so is the teleport+homeguards on rammus. The 40% CDR isn't really necessary as well.

Finally, Ninja Tabi is godlike on rammus, get it.

(I have a lot of experience on rammus and I have played him top in the past)

Then I see no use for taking Rammus top over jungle. Minions won't necessarily attack you just because you have Thornmail, it doesn't work like that. If you're worried about not dealing damage, then you're playing the role of a tank wrong. You have two carries for a reason. If you are planning on one combo-ing their carries, you'll never get past their front line anyways because Powerball is easily stopped, and you lack Flash.

He doesn't need Thornmail for his taunt to lock down a carry long enough for them to get killed, or to do the same to whoever is diving your own carry.