These are the metal pans I was using, upside down and drying in the sun:
Then I placed metal recycle siding on the floor to completely cover it. I topped that with wood shavings and then hay. Now the rabbits are back in (with two pheasants), and they seem to be happy with their updated digs. Now we'll see if it's varmint-proof.
Tom is building me a greenhouse with all the windows that were left here when we bought the place. We purchased an old glassed-in screen door yesterday for it at a recycled building supplies store. There we also found a motor that went with an old joiner and bought that too. This motor we can attach to the hay elevator, and it will be more powerful than the wimpy one that crapped out on us last year in the middle of stacking hay.