I feel Wukong doesn't really need AS. You have a steroid for that already, and you're going to be spending more time casting spells than attacking. For offense, raw AD goes much better on him due to the hilariously insane scaling on his ult. The Lifesteal seems nice since he doesn't have sustain, but there are far better stats for him (Tankiness, CDR, AD) It seems like luxury at best, and in that case you'd probably want something like a Bloodthirster over a BotRK.
"Combine Cloak and Dagger with Boots of Swiftness so CC doesn't stop you from moving faster toward defeat." - Frost_shock_FTW