It seems that you need to split your site to a Front End and a Back End.
On the front end you have users registering and submitting designs.
On the back end you update the users status.
As far as the database, i'm not sure how you could transfer the data to a MySql Database.
I'm still not clear on what you want happen on the front end pages. But it looks like you could use Security Assist to build your user registration, profile, login and logout pages. Then you could use Form Builder and DataAssist to build the page to submit your design.
On the Back end, you will run DataAssist to create, your update and results pages for the users and the designs.
I'm not sure if i'm on the right track with, but if this does not sound correct, please explain a little more on what would you like to happen.