Anyone else use them? I built four 72" x 48" x 12" raised beds after last year's grow season. Two of them just have composted coffee grounds and regular garden soil, but the other two are modified hügelbeets. I dug two pits about a 18" deep and filled them with large branches, twigs, fish, grape vines, egg shells, coffee, all the previous year's organic material etc. and then covered them with soil.