moto x 1st gen 4.2.2 Upgrade to 5.1

Verizon
Moto X 1st Gen
Android 4.2.2 - Stock rooted
Unlocked Boot loader - not DEV edition though
TWRP 2.7.1.1 recovery

Question:

To upgrade to 5.1 do I just need to revert back to stock boot loader and do an OTA update?
Will the OTA re-lock my boot loader?
After the upgrade to 5.1 do I just reload TWRP recovery and flash SU for root access again?