I played ap nunu jungle many times ... great damage output ... but even if i did good scores was looking for a different build , cause as ap nunu you have only 2 spell to attack and one to buff yourself or ally too. Your guide is original, rely on my same idea of different nunu, and i'm gonna try it for sure.
You deserve a +1, but you should work on your bbcode.
Good job man.

Just to the build:

1. You are very squishy with this build because you got no HP. Try using Frozen Mallet for the ultimate slow as Nunu & Willump, this way, you can chase anyone

2. Madred's Bloodrazor isn't a really great item and you need waay more armor to be effective. I would try out Nashor's Tooth and Frozen Heart since both fit your purposes. You get more tanky, more cc and more as.

3. Void Staff and Youmuu's Ghostblade are definitly not needed. Nashor's Tooth is just way superior to Youmuu's Ghostblade on Nunu & Willump and he has a build in ghostblade anyway.

4. If you are totally as-based, Wriggle's Lantern early is your best friend. Also at lategame you can trade it for Bloodthirster.

5. Hextech Gunblade is nerfed to the ground and sucks.

6. Start with either Boots + 3 Health Potion's for a quick invade or try out Vampiric Scepter for infinite sustain.

7. Malady sucks.

My build:

Wriggle's Lantern( Bloodthirster), Mercury's Treads, Phage, Wit's End, Glacial Shroud, Frozen Mallet, Nashor's Tooth, Frozen Heart.

I tried it and it was very usefull

Good item and ability progression, losta jungle ganking.

not good

thing

And, building an early Wriggles Lantern is better for junglers as it gives you a free ward every 3 min (don't let'em steal our blue/red)

Do you get the same ulti result with this build or it's just for basic attacks???

Tried this out and loved it! My only problem is dealing with people who are like "wtf are you building"