It can be found right here:
https://www.halowaypoint.com/en-us/players/daedalos42/halo4/fileshare#!/?section=GameMap&SearchDate=7&SortBy=2&view-select=Tile&startIndex=0
It’s called Sword Base Evolved!!
(Note: I did not make this map and do not claim any credit for it what so ever)