Thanks Ria. Like I said, I'm not averse to putting ventilation in the roof if it turns out it's needed. The enclosure is in a large and well ventilated room, it has large holes that are on opposing sides, and also create a chimney effect. The ventilation seems fine. I'll absolutely keep an eye on it and modify if needed. We have plenty of resources, knowledge, and time to fix any issues that might arise. Coupled to that we have a couple of emergency cages, so no hammy will be coming to any harm
thanks for all your feedback!