Spot on Jazz - for plywood sheets read spare crownboards with taped over feed holes. Saves a world of pain.
I wrote an article for my divisional newsletter a few years ago on the the many uses of the humble crownboard with just a few minor additions they quickly become some of the most useful spare kit to have. I own loads more than I have hives and yet still often run out. Buy a load in the winter sales for under a tenner each, saw a couple of diagonal cuts two inches apart in one or more rims, add a deeper rim all round of one inch pine to one side, gaffer tape over the feed hole if necessary and voila - fondant eke, super “stand” and temp roof, winter top and bottoms for stored comb boxes, emergency spare floor, emergency roof (with a brick on it!), split board for vertical splits, snelgrove board for enthusiasts and er, crown board. Luv ‘em. Can never have too many.
I would use one as a dinner tray if I could get away with it