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I would think you could drill hole for ventilation so that would not be a biggie. What are you going to use for roofing? You might could use metal roofing and tilt it for the drainage and the rise could give you some ventilation too. I did that on my breeding pens. Just covered it with hardware cloth.
You can get paint for plastic, might add too much to the cost. I have only seen it in spray paint but they might have it in gallons IDK.