The simplest ideas are sometimes the best - this is a 1 inch projection of 3x1 mesh designed to fit inside a 24" box, particularly the Top Box, but you could put it anywhere you chose. Provided with cable ties for a snug fit. Slide hay down into it (non chopped is best) and your bunny can forage from it as they never eat the hay they are actually sitting after a day or so. Makes feeding easy and you can add grass, herbs all sorts of healthy treats inside as well. Measures 22 inches across by 15 high.
Rather like an edible work of art for bunnies!