Ok here is one I built that has been VERY successful for the little ones. Reason being is It provides cover concealment, the ability to walk and get prey on the sides also, ventalated but fully enclosed. Just a mist bottle and some food sources is all you need after that. The sides can even be sprayed wet to provide humidity.
The cage is wood frame with plexiglass top, a 5.0 light, shear white fabric sides and bottom. All screwed and stapled together
Size can be at your own discretion, mostly pending on amount of young you may want to keep. I have found this much easier than housing all in separate containers with great success.