As announced in my previous mail, Maarten and I finished the database design to store surveys, sections and questions.
The current design can be found at: http://docs.limesurvey.org/tiki-index.php?page=Database+Storage+Engine+Project+M1+Database+Design
Keep in mind this is NOT the storage of the answers a user gives on a question. How the answers will be stored is the next step on our agenda.
If you have any questions or comments, feel free to let Maarten or me know on IRC or just send one of us a mail.