In this case I am using live sphagnum moss. I usually use rockwool cubes. I had run out of them however. The pots of cuttings, ready to be placed in the rooting chamber. Most folks I know use a large aquarium, with a heater placed inside or underneath.
Water is added to the inside to keep up the humidity.
Currently I am using a large bench, which has had a rim built around it and a frame over top. Over this is draped a layer of 4mil clear plastic ploy film. Inside is a nursery grade heating pad with trays of water on top. The pots of cuttings will sit in these trays. Note, one set of cuttings has the leaves cropped.