Agree, "largest" base has some pathologies. Put machine #1 at the starting location, run in one direction, and put machine #2 just before time runs out. This

Agree, "largest" base has some pathologies. Put machine #1 at the starting location, run in one direction, and put machine #2 just before time runs out. This is going to be a huge factory (as measured by its bounding box) but it's not super interesting.