I currently own a Moto X Pure Edition XT-1575 and now, my Moto G4 Plus XT-1644 that these steps work to get Viper4Android working on your G4 Plus.
1) UNLOCK Bootloader
2) Have TWRP Recovery and BE ROOTED
3) Reboot to TWRP Recovery and flash ...
apk files are in link
-Time & Weather Widget (360 style-shown in pic)
-Gallery (didn't work on AICP)
Not sure if this was posted : http://review.cyanogenmod.org/#/q/project:CyanogenMod/android_device_motorola_clark
Official build in progress:)
Links to those files by chance?
Sorry i meant to list them all and my gf distracted me, didnt mean to hit post.
Flash them in the order they are #'ed. After all 4 are flashed, wipe Dalvik.
After it's done booting, flashed attached update...