I feel your pain. i've been there. after my house burned down (gotta love idiot neighbors) I had 5 young bp's in one 10 gallon tank for almost a week. the only advice I can offer is that MDF/partical board from lowes or home depot isnt toxic to your animals and also normally cheaper than plywood. also laytex paint will seal in the sap from plywood if you want to go lid less. also you could put everyone in there rightful tubs stack them in a closet with a space heater. yes no belly heat but they wouldnt be getting stressed from being over crowded. good luck and hope everything works out for ya.