Here is a picture of the DDM base. I have not built mine yet, but I don't anticipate any problems:
The red dots are where I deleted the green atoms, fluorine. The white dots are hydrogen as usual. After I wrap up the DDM (tomorrow?), I am going to reuse this base and its fluorine/hydrogen surface to make this:
This image is from NASA, and I believe it is therefore in the public domain. The one I build will look way better than that, and it will move. Maybe I should worry about NASA stealing mine? Just kidding. If they want it, I would be honored to let them have it.