Here is a plate pattern I made VERY many years ago. Initially casting aluminium, but I have successfully cast brass and iron from the same pattern. Designed for a custom made wooden flask, and done in CO2 / sodium silicate sand. I made up several at a time, sandwiched them between plywood boards, and clamped them up with studding. Obviously cast in a vertical orientation. It makes a copy of a Victorian 'Khasi Bracket' of the sort used to support high level toilet cisterns, but now used for shelves and all sorts. I've still got one supporting a large brass bell at my front door.