My father passed away in 1977, after a long illness. A plot at the cemetery was already paid for, which was next to my mother, who passed away in 1963.
The only arrangements to be made were for the funeral home, casket, etc. I had been in business for 7 years at that time. I thought what a great tribute for my father would be for me to make his casket. Well, the funeral home, and a few others that I checked with don't accept caskets from any sources other than their own.
It seemed that there is a controlled distributorship on those things. If you think about it, what other commodity is likely to never go out of being needed. I wouldn't doubt for a minute that the companies involved are "connected". Maybe like "You stab 'em...we slab 'em".
So, I had to do it their way. But, what was interesting was one of the funeral homes I called commented that if I could make full sized caskets, why not make caskets for pets, inferring that it could be very lucrative. I found out that many people spend more money on pets than their parents.
As for myself I'll probably make my own if a deal can be made with a funeral home. I don't believe in cremation. I think about what our soul is (if there is such a thing). It may represent what we managed to contribute to life while we were alive. Once we die our soul may be sustained by those that survive us.
For example, how my father lived and what kind of man he was in life, is how I now think of him. I bring to thoughts his soul...so to speak. How we have lived is probably how the thoughts of us are brought back to life when others think of us. IOW, if we were good, that's how we will be thought of. If we were bad...bad thoughts.
To be buried leaves some semblance (our remains) to exist. To me getting cremated destroys all evidence of our presence. It seems more of punishment than anything else.