Add fields to post form

I have used WordPress to create several sites for my clients. Some of them are approaching content management systems. However, I have one client, a physician, that wants to change the structure of the post form. Instead of just Title and then a text box for the post content, he wants to have more control.

Example boxes:

Case Title
Case summary
Findings
Discussion

I found one plugin that can add boxes to the end of the form, but not at the beginning.

Any other plugins or ideas?

(PS– I host these blogs on my own server, so I can make changes)