Customizable Crystallographic Building Block

This is a structural construction kit.
It uses a natural set of construction blocks which can fill/divide space.
These blocks are based on natural basic crystal structures with high symmetries. This makes the construction kit more direction independent then conventional ones.
### user defined blocks:
Generate more building blocks (& couplers bricks) by entering the
coordinates of the local nearest neighbours. (Only if the entered nearest neighbours are correctly taken from a proper crystal structure the resulting body will form a solitary space filler.)
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A web seach revealed this strongly related kit:
http://www.georgehart.com/rp/FCC.html
### Science:
The basic blocks are the Wiegner-Seitz cells of the following crystal lattices
bcc - body centered cubic
fcc or ccp - face centered cubic or cubic closed packed
hcp - hexagonal close packed
some other voroni cells (e.g. one of a diamond atom) are also included
### Future application:
In [atomically preci