For my snake I use a combination of these
http://www.petsmart.com/product/inde...ductId=3884237
and these
http://www.petco.com/product/4353/Pe...plies_Habitats
Idk if that could work for your custom lid, but as long as it has a frame I think it should work
Edit: I say you go with the Petco ones since it would be easier to custom mold it into the shape you need. The petsmart one is better for screen lids
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