Hmm what Sryim said, I'm not really good with Cait, but thing like Frozen Mallet seems to be of great help to her, not only it gives her more HP, but also slow, allowing her to kite more effectively and make enemy's homerun harder, especially when low on mana, which seems another thing to take care of. ATM you have glass cannon Cait, which is never good idea at high levels/rankings. Also I'd rather go for Flash, tho' Ghost seems vialable option too because it's not single use, but over time effect.

Also what goes for Last Whisper, leave it for late game if you really want it, bit I'd rather go with Black Cleaver, unless enemy team consists of 3+ ppl stacking armor or your group is AP heavy or someone already has Black Cleaver. Other than that it seems like a good guide;) Bit simple and short though, to be honest. (Working on Akali guide, as this site lacks proper Akali guide, when it's out you can use it to your heart's content to see how to make awesomely awesome guide^^)

@Sryim bad

thx bro for that advice i uaslly go for the last whisper first tho cuz early games it helps with more armor pen and y that time because i have alot of armor pen im gonna get way more kills that why imediatly after last whisper i say Infintie edge cuz ull rock socks of with it but i appreciate the help tho but i would also like to say u make rlly awesome builds

Few things.

Last Whisper is more a late game item, imo. You'll do a lot better spending a bit more gold to change it into Black Cleaver or delaying it til after Phantom Dancer/Blood Thirster.

Way too squishy. No health items, no armor items. Maybe you can start the build with 1 or 2 extra doran's blades just for survivability, or even swap out Last Whisper/Madreds for some defense if necessary. (situational)

The attack sequence is unrealistic. 2 Qs, 1 W, and 1 E, won't send them home. W might not land, E pushes you back, and Q just isn't strong enough late game. Early Q's your best choice. Mid a mix of them. Late, auto-attacks are enough.

Nice build and nice guide ... :D