Custom Lattice Unit Cells

Is there a way to create your own custom unit cells for Additive Manufacturing module?  Using beams or surfaces.

I would like to create a diamond lattice out of beams

I would like to create a face centered cubic out of beams

I would like to create a octagonal, but with surfaces instead of beams. I want the ability to turn on and off selected surfaces, assign a thickness to the surfaces and vary the density, just like in beams.  This would create a closed or semi closed cell structure that is self supporting for 3D printing.