There is actually a shortage of people donating their body to science, it's not actually very easy as it needs quite a lot of legal issues to be solved before you go. Sadly I understand I am someone they would be interested to 'work on' given the chance!
Fact is I just don't want the ceremony...
I just don't see the attraction of your friends and family sitting around in a room with you at the front in a box, rather be remembered for the times I was with them alive.
Donation to medical science is an alternative, there are others.