Download Gummy ROM for Galaxy S3 (for all AT&T, T-Mobile, Sprint, Verizon, Canadian, US Cellular, MetroPCS, and Cricket)
Download HighOnAndroid OnePlus One Conversion Kit w/ No Lockscreen, Audio FX (optional- use this one instead if AudioFX app force closes)
Download Android 4.4.4 Gapps (Use micro if you want AOSP camera along with Google Camera you can install from Play Store or use stock if you want all latest Google apps but you only get Google Camera)
NOTE: You need to update you CWM Recovery to v220.127.116.11 or higher OR also update your TWRP Recovery to v18.104.22.168 or higher. You can update your recovery by downloading CWM/TWRP then using Flashify app CLICK HERE.