Hi there Jim,
I don't know what a "minimum" enclosure size would be, but I do know that they are a very active species, so I offer them as much room as I can accomodate. My Kimberlies are set up in a 6' x 2'x2' melamine trough, with a plexiglass top, with a few holes drilled in the plexiglass for oxygen exchange. 6' may seem big for such a small lizard, but let me tell you, they use every inch of the enclosure, and if I had the space, I would give them bigger... They deserve the best...haha.
Glauerti truly are a wonderful species to keep, their sheer beauty, gracefulness and temperment make them one of my favorite monitors that I keep. Hatching the eggs can be a b**ch though...haha(see earlier post).
I have found that females, since they are not as massive as males, can dehyrdate quickly, so I make sure that I mist them daily/bidaily- my female will drink right from the spray nozzel of the garden mister, however she won't drink from a bowl of standing water... But then again, I guess that hydration is an important aspect of all monitor/reptile/animal/ living organisms...
I have pics and more info describing how I keep my glauerti on my website if you are interested...other than that, I hope this helps a bit, hopefully some of the other glauerti keepers will post their experiences with them as well...
Take care Jim, have a great day.
Bob
The Odatriad