Most efficient way to create a group of "unit cells"?

Hi all, I am trying to make a 3 x 3 x 3 arrangement of what I am calling a "unit cell". I have enclosed a model of the unit cell I am working on. Basically, I am unsure as to the most efficient (time and data wise) to make a 3 x 3 x 3 arrangement of the cell.

I have tried to make a 2D 3x3 arrangement sketch, and copy and paste that sketch on the other planes, which worked as far as making the "skeleton" for the arrangement (without the thickness) but trying to make a weldment on every line would take forever! I have thought about making linear patterns, but I'm not sure completely how to make those work.

Any suggestions on what would be the most effective way of doing this would be much appreciated!

(both the "unit cell" and the 3x3x3 "skeleton are included)

Thanks in advance!

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