Tried this build on Aram, ended up carrying the team. thank you

First, I love that someone has made a Death Rocket Corki guide. However, yours could use some love. You should check out jhoijhoi's "Guide to Making a Guide" as well as some of the more prominent guide makers to see formatting and such. Big text walls don't catch a readers eye.

The other thing is that I feel the build itself could use work. I run AD quints and Martial Mastery to make last hitting and trading much better pre- Trinity Force. In this time you're an ADC anyways because you don't have your long range rocket poke. Also, this frees up your seals because you won't be spamming until oom to do any damage at all and you can pick up hp/lvl or armor. Another big point I have to hit on is the alternative items. Meiji's is just meh on someone who has such a long CD escape and no shields/heals/as much safety as Lux or something. The other thing is that due to your lower AP ratios and having Trinity Force in your build, I feel like Rabadon's Deathcap would always be shown up by Zhonya's Hourglass just due to the superior utility (I can assassinate singled out targets with Valkyrie? AWESOME)).

Just some suggestions. I hope they help. Good luck.