Auto Create Blog After User Sign Up - Wordpress Multisite

I am currently running a forum with Invision Power software and will be adding Wordpress multisite with buddypress to it. I have multisite and buddypress installed and working. I am using a single sign on between my IP Board forum and Wordpress found here: [login to view URL] All existing members are added into the WP database once they navigate to a WP page. Job Details: - Auto create a WP blog/site after successful registration (added to WP database) based on their username - Domain of blog/site to be [login to view URL] - Be written as a plugin