Well I'm not sure about peach-throats as I've got a sav - I think peachies are larger aren't they? Anyway, we're in the process of custom building an enclosure and it will be made of a frame and then marine-ply wood (as it's already water-proof). At least that's the plan at the moment. Wood is the best enclosure as it will keep the humidity in well. I'm sure others with more building experience than me will chip in here.