I really like this emphasis on early health regen. It seems like it would help laning a lot, and the resistances build later leave you nearly invincible. I haven't tried it yet, so I can't really vote up or down.

However, I would like to point out that his ultimate's damage doesn't return damage per se. Idol of Durand's damage increases for each TIME he is hit. So taking 100 damage split between 10 attacks returns no less damage than if you take 1000 damage split between 10 attacks. So when you say you want take as much damage when you're using your ult, you mean take as many hits.

Other than that though, this seems like a great tank Galio build!

I haven't tried it yet, so I won't vote up or down but...

With no AP (well, 100), the only useful thing you can really do is your ultimate and slow. This is technically the point of being a tank, but your damage/slow output is much lower than a tank like Mundo. I do think that this works great with his ultimate and Bulwark though.

EDIT: I'll probably try it eventually though, and get back to you on how it worked.