awesum build.:)

A double Shurelya's Battlesong can be good in a team ( very fast Naschor or push ), and the Philospher's Stone gives to you the choice to do a Eleisa's Miracle(reduce CC, which is broke by Remove Scurvy) or a Shurelya's Battlesong, so I choose a Shurelya's Battlesong. And it gives CD reduction, dont forgive it.

+1 great guide!

several comments
you need to take advantage of gangplanks parley crit, 1 or 2 Frits early game can change the outcome of the lane, if you force recalls.
why get warmogs early? you realy do not need it, and atmogs is pretty weak early game.

your glyphs, I would advise magic resist, but that's my opinion. if you like cdr I'm cool with that too.

Also, I agree with major lol, you don't need shurelyas. you have raise morale, it should be enough.

Overall it's a great lab, but I think there needs to be more laning / gameplay sections, your skill tips are amazing, I love your coding and pictures, your guide is very aesthetically good and I really congragulate you for the effort :)

if I helped, +rep!

Beautiful guide!

I've never seen somebody actually give skills rankings on their own guide before. You explained your Cheat Sheet very well but... you're missing a gameplay section! Once that's done you'll have an awesome guide here.

As for your build, it's ok, but Shurelya's Battlesong isn't very necessary. I know Phreak uses it, but he's Phreak. That item should be left to the support, then you can take another damage or tank item. Maybe life steal or Youmuu's Ghostblade would work out. Trinity Force is an excellent item for GP because of the passives, but you take it last. It should be taken much much earlier to take full advantage of it. Especially the Sheen proc, because Parrrley uses that proc, making it much more powerful.

Overall everything else is ok, so you deserve a +1. Turn on comment to vote so it can't get downvoted without reasoning. Wouldn't want to see a guide like this get troll voted :)

Overall a good looking build. Should have good survivability and fairly good damage. I'm not sure i like Trinity Force, as he doesnt really have any skills that he can truly spam to take advantage of it. I prefer to run Infinity Edge to increase the attack speed and drive up the crit chance. The extra crit chance greatly benefits Parrrley, and having great attack speed is what AD Gang is all about.