I didn't make it!
It says it is required to combine the tactical cubes. It is now where in the game where I can build.
30th September 2007
It says it is required to combine the cubes for that biiiig cube. You have to have eight Borg Cubes. Then highlight them and click on the revealed "Cube Fusion" icon. Then enjoy the show an go to assimilate everything.
Warriors from Fluidic Space
8th August 2004
Hello: The Borg Technology Assimilator has a research button like the Research Labs, click on it and you'll see that you can make only one thing for research, that's the Collective Hub. Now, Resistance is Futile :D.