Thanks, Greg.
I raised a WC Nile back in the nineties, and it took a little longer to establish trust, but in the end, if you play by the rules there are no problems. My Nile turned into a gentle beast, getting free roam in the basement when supervised.
Haephus is a joy to work with in his enclosure, as long as he is in his own territory. The last time he ventured out (while I was cleaning his water tub), he behaved as if he was in the wilds of Africa and I was a predator stalking him. Quite the wrestling match to get him back in! One of the reasons I believe so strongly in walk-in enclosures for large varanids; on their turf they trust you more as they're not stressed by new surroundings.
I'm yet to get anyone else in the house to stroke him; they're all terrified lol.
Chris