“Should I include reconstructed speeches in my autobiography?”
It really depends on the context wherein I might include one. I definitely would not include a speech made by the mayor of my town because it would bore my audience greatly. However, perhaps I would include a speech that influenced my life in such a great way that it couldn’t be ignored. In this case I probably would include short quotations from the most important parts of the speech, in order to keep my reader’s attention.
I definitely would not include speeches where they would be irrelevant, boring or out of context.