As soon as the RemasterPi code is completed you can find all info on how you can use it here on this wiki. If you feel like contributing in any way you can start/join discussions in the Discussion Board. If you like to request a new feature you can file a feature request in the Ticket system.
Anyone is welcome to contribute in any way you can or like, the project is BSD licenced so it's as open and free as it get's. Hope you will enjoy it!!