While a cage of that size would be sufficient for captive borns, I would recommend nothing less than a 2' by 2' by 4' screen cage for WCs. They tend to stress easily and are subject to nose rub in smaller cages. In addition as a canopy dweller they are really better off with the ventilation that a screen can provide as well as a decent hotspot and a source of UV lighting.
I have mine in almost this exact same setup. A fully screened cage with a moist bottom in my case moistened poret foam (which is washable), two large branches, and a water bowl. I live in Southern California and it's very arid here and they seem to do fine. I mist once in the morning and once at dusk but it's a lighter misting. They soak themselves almost religiously at night then eat then sleep. I also have an infra red basking lamp for them at night as it gets cool here at night they will climb up towards the lamp and stay at their comfortable gradient.
I have had mine WC for 2 yrs now and they seem to be doing just fine, although I had some close calls with parasites last year and a bacteria infection on one of the guys backs. After getting proper meds from Dr. Fry and following his regiment exactly as he prescribed they recovered fine.
WC is definitely a risk for parasites, stressed out individuals, and generally just more prone to health issues.
I have another group of CB ones from Novy a little older than my wc they have not had any problems since they were froglets. I would definitely recommend CB over the WC as they are much easier to care for and less chance of any health issues.
WC captive 2 yrs
CBB Novy almost 3 yrs.