Makes a cell from your own beams. The Domain box is the cell: the beams are scaled from the box onto the unit cell, and its one parameter is Thickness. Anything outside the box is kept, not cut, so it pokes into neighbouring cells; shrink the beams or enlarge the box to avoid that.
The cell's beams, in the same coordinates as the Domain box. Their thickness is not read: the lattice that tiles the cell sets it.
The box that is one cell; its contents are scaled onto the unit cube. Give it depth on all three axes.
Values the block gives besides its output. The editor lists them under Properties, and an input can read one by reference.
The lattice inputs the cell reads: its thickness, its offset, or both.