Here is a shot of my File Cabinets. The left and middle cabs are from HON. They are Legal size and fit two rows in each. The one on the right is a Office Depot cabinet and I personally hate it. It isn't tall enough for the books to stand straight up. I have old previews and wizard mag supporting those books.
As for my slabs I haven't figured out where they can go in the cabinets. I only have 20 or so. I think the big thing would be to make sure that the drawers were tall enough to support a slab. I don't think that it would be that good to put the slabs sideways in the drawers.. Maybe a lateral filing cabinet would be tall enough?