This week following question types have been implemented (a week before the timeline :)) :
with it's mappings to the front-end question types as given here: http://docs.limesurvey.org/Database+Storage+Engine+Project+M1+Database+Design#Question_Type_mappings With this the implementation phase is complete, now just integration and testing phase remaining.
Decided to do testing before integration. Getting the know-how of the testing framework of CI: SimpleTester and get started with testing the full DBSE. Also, to work out on the integration details (when and where to start).
Any comments/suggestions are welcomed. The project action plan can be found here http://docs.limesurvey.org/Rebuild+the+database+frontend+using+CodeIgniter