Ferret Nation Liner Help!!

I am ordering a Ferret Nation 182 Double Unit, and I am going to make Fleece Liners myself, I went to my Aunt's summer sewing camp 3 years in a row, and have made many things including things for my daughter. Now, the thing is, I know how to make the Fleece Liners, but I don't know how much fleece I need. I would need to make two full sets. 4 shelves, 2 main pans, and 2 2nd level floor covers. How much Fleece would I need for that? I want to make an extra set so when I switch I have a clean set right away.