Just one point - make sure the monitor can't get its head through the welded mesh - if it can get its head through, it will be able to escape - they have an incredible ability to slim themselves down to squeeze through tiny gaps. As for eating other lizards, one story here already, but I had an adult tristis in an enclosure on my workbench at the Museum some years ago, went out for morning tea, came back to find the tristis had escaped its enclosure and climbed into a tank which had a newly acquired, exceptionally bright coloured gouldii hatchy, and only the tail was visible. To add insult to injury, the tristis regurged the goulds the next day
!
Jamie