Are there going to be any humans? It may be a bit boring with out them. I think you should go for a full out civil war between the different companies/factories.

This could be the storyline.
The humans after planning to have left the robots alone for 100 years to make a hospitable world find that the robots have made little or no progress. Instead they are fighting among themselves for the natural resources. The humans create a coalition to end the war of the robots but becasue the companies (robot factions) have become independant it is not as easy as they thought. etc... war begins

This would pit three different classes against each other. The senate factions who continued to terraform the new earth but now the humans attack them because the humans see their army as a threat. The humans who arrive unprepared for war begin to build weapons factories and recruiting stations. The independant robots who have become individual factions fighting for the resources.

This could be an expansion or fitted into the original version.

Ideas on the look of robots. Just to clarify my neoclassical idea here is an example of what it could look like