Chicken wire or hardware cloth either on a simple wood frame would work. No need to get elaborate with it. Unless there is some other way of getting ventilation in the tub I wouldn't use plastic or glass.
I'm not an expert,"ex" is a has been and a "spurt" is a drip under pressure!
I'm not an expert,"ex" is a has been and a "spurt" is a drip under pressure!












I think the one in the pictures is a golden - my others are red sex-links and a lot darker shade of feathers. She was always the 'different' one, quite lucky that we picked her up, because she's always been specially pretty!