The idea isn't a bad one, but I've free ranged several chams quite successfully. By the time you assemble what you'd need for a free range (nice bushy tree, lights, something to collect all the misting water, feeding box) you will probably spend less than the Condo costs and its easy to provide more usable space for the cham. I also prefer live plants for their moisture holding abilities. I would find the actual usable living area fairly small for the species best suited for it (larger, lowland warmer climate less shy species such as a panther or veiled). Timid shy smaller species could be easier to lose track of. A montane species that requires higher humidity and more spraying wouldn't work as well unless your room is tropical and wet.