Sounds pretty good. It's possible that you won't even need the armor quint on some junglers if you don't fight early. I think flat armor or HP/lvl is more common in top lane because of how important the early game is. You could have a scaling armor page in some matchups I'm sure.

Thanks to Janitsu for the sig!
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You will start with 6 armor level 1 thats 3 less but i think by lvl 6 you will be strong rest of the game each lvl.
Here is what i mean.
http://www.probuilds.net/guide/NA/1487054704/60783
Also something similar but adc is run all hp yellows but u take 1 armor quint giving you strong early game or all in.
http://www.probuilds.net/guide/NA/1486826933/35301382