My hutch sits on a very large run (both homemade) and I put two large litter trays in the run, under the part protected by the hutch. (Have also put bubble wrap part way along the run for extra protection). They are never shut in the hutch and love to lie in the litter trays (lined with newspaper with hay on top). I just put newspaper and hay in the hutch and very rarely find wee or poo in it.