oh ,sorry fail with runes,i'm using magic pen runes ;) will fix that ;)

just a correction on runes, you have greater mark of desolation which are armour penetration runes but you seem to be aiming for magic penetration runes which will be given by Greater Mark of Magic Penetration

Looks a bit sloppy but that can be easily fixed. I used to main nidalee and I personally like to buy the sheen > Void staff > Lich bane as it gives the nice Sheen passive early. I'd often chuck in a RoA over Rylais as you have a lot of mobility with cougar form already.

try neatening up your guide with jhoijhoi's build maker haha it will look ten times better. Also, you should experiment with exhaust, it works well with cat form :3