This species can exceed 10' in overall length, so Papa could possibly get bigger - just understand that most of the length is in that strong, prehensile tail. He eats a "monitor mix" comprised of f/t rodents of various sizes 3 times a week & we supplement with cooked poultry.
We typically do his nails in house with a heavy-duty drill attachment, although we've also had our vet do them during a surgery to remove an abcessed tooth from Papa's mouth. They were MUCH easier to trim while he was under anesthesia! Fortunately his new digs allow for lots of room to climb, as well as tree trunks & branches to climb on, so keeping his nails worn down should be easier in the future.
K