How do you know how big to make an urn. Dad wants me to make him one and he weighs about 200 lbs. I weigh 155. How big would it have to be? Is the bottom supposed to be removable in order to put the ashes in it? I have seen some made out of stone and the inside was pretty small. I want to find some ideas to make one and adding an Irish symbol to the top, maybe a shamrock for dad. I appreciate the help you all give.