First thing you want to do it start with
14x14 black on the floor and then make the orange part 8 blocks high and then put a layer of black all around. This part is a little hard for me to explain so yeah..
You make a 12x12 in the sky kind of for the top or the chest and then just fill with orange
So hope you enjoy a this sorry if this is a little lame as well.
Sorry if I posted this twice