I know carpet breeders keeping in similar size cages.
Heck, I raised a bredli in a 60cm Neodesha for four years and I have an eighteen year old GTP that I have kept in a 30cm x 80cm x 75cm tank for the past fourteen years.
If you properly outfit a cage with hides, climbs, perches, ledges, etc., then the available surface area can increased rather dramatically