Sorry if this is in the wrong forum but I need some help designing a BBQ/Fire pit for my Rec Department. I'm looking at building it out of cement and block. It will be about 4 feet by 20 feet with 3 or 4 sections. We would be using it for our big chicken BBQ feeding around 200 people and it might also be used by smaller groups that rent our place. I know I could just make a box with the blocks but what about a draft and how to clean it out without having to scoop it all by hand and so it doesn't fill with rain water. Any help would be great. Thanks