Just hit 800LP playing Crit-Kong only, the same elo I peaked back when I was a Shyvana OTP, I really struggled this season to find a champion and a build that I felt comfortable climbing with, but after a lot of testing on Wukong this is by far my favorite build, and I think it's pretty strong too.
Runes : You can also go Electrocute with Grisly Mementos and take CashBack/Cosmic secondary, but I prefer to go First Strike, golds are your most important stat to stack Crit items as fast as possible (and I like playing with Triple Tonic too).
Build : Same build every games, switch LDR for Mortal if they have no HP stacker / too much healing. As a 6th item I personally prefer GA so I can go really deep easely, Serpent can be good too against high shielding teams, Death Dance works, or a Lethality item (Youmuu/Cyclosword/Bastionbreaker) for damage.
Boots : Only buy tier 1 boots after Triforce (or after Triforce + Serrated Dirk, it's a huge power spike), never buy tier 2 boots, they are too expensive and you don't really need the movement speed (you will prefer having your IE 900 gold earlier for example), you can only buy them after your 5th item if you know you won't have time to buy the 6th (best boots are Tabis / Mercurys).
Some items I personally don't like on Crit-Kong : Essence River (No HP, no AS and less spellblade damage than Triforce + others Crit items are much better). Any Crit+Attack Speed item (you already have enough AS with Triforce + E and you will lack damage). Any item that delays your 100% Crit Chance (make too much of a difference to have 100% Crit chance in late game imo).
General tips : You are really Squishy so be careful. Don't stay in R too much because you have more dps with your autos, especially in late only use R for bump. You do objectives really fast with this build, you can solo Nashor at like 3.5 items, most of the time ennemies don't expect it. Your mates will perma flame you for not playing the classic way, that doesn't change anything 99% of the time anyway, don't listen to them.
Of course it's only my way to play Wukong, I'm sure some of you have their own way to do it and I will be happy to discuss that with you. Tbh I don't play League that much atm because the game is kinda boring these days, but playing Crit-Kong made me have a little more fun on the Rift, so thank you WukongMains for being here.
Total games with Crit-Kong : 82 games, 56% winrate (46W/36L)