Hmmm, Marboro, you'll have to be a little more descriptive in your question. If you are saying 'I have a database in Domino Designer which is under Source-Control' then I am assuming that you are talking of the on-disk project possibility of the Domino Designer, and that you are using a Source Control System which is working against that on-disk project.
You will need to go through Notes-specific objects to be able to create a new database (which is what I assume you mean by build a database).
Typically, you would be working on a template on a development server, this template would have a local replica on your local machine, and you do the source control with this local replica. Then, when you want to create a new database, you either do it manually, or you run a lotus notes agent which will do the creating for you.