NSW CoP requires 0.32 m2 of floor or wall space for gilleni. Caudolineatus, kingorum and storri are also in the same category but aren't classified as climbers so it can only go off floor space. So if it measures larger than about 0.6 x 0.6 m, you can legally house any of those species, plus brevicauda or primordius which are categorised even lower. Considering most keepers agreed when the CoP came out that the size requirements in most cases were unnecessarily large, it's kind of funny to see so much argument over this now. I personally reckon gilleni would be fine in there and, if you've never owned them before, you can't beat small monitors for character and enjoyment (except maybe with big monitors ).