When I have large numbers of cocoons, I often use trays. There are about 2000 cocoons on this tray. One tray is turned over to act as a lid. Trays are offset by 1/4″ so that emerged bees can exit. Duct tape or strong rubber bands are used to keep trays in position.
Using 1×1 sticks and set between a couple of highrises, a structure is created to hold trays at the upper level of the yurt, but not under the center hole of the roof.