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I've not been able to work out how the big black polystyrene ones are ventilated, it all seems v much focused on being almost air-tight to hold onto the warmth. Are the pipes you mentioned going to be kind of like rungs, or straws arranged in a Kerplunk fashion? Do they need to vent to the outside or is creating airchambers within the thing enough?
Sorry for loads of questions, just sort of thinking aloud
jackbepablo
Light_EDDed
The main one I’ve seen is just a box with a release valve for the liquid. Because mine is made from insulation board it will probably “leak” the liquid out anyway.