As part of the brick patio I've been working on, I added a built in fire pit. I'd like to have a round dome or metal cover that will fit inside the round screen and drop down over the coals to (hopefully) snuff them out, or at least prevent embers from flying around. Inside diameter of the screen is just under 29" to clear the bolt heads that hold it together. I'm a carpenter, but I've got no experience with metal work. Any ideas out there?