I noticed the chart doesn't mention combat fabbers which have HUGE range and can be beneficial when reaching absurd amounts of energy and metal production. What are their numbers anyway? They seem like a good choice for when you've reached your maximum crowd limit for helping to build nukes and halleys. I've found having a swarm of air fabbers assisting multiple buildings with the area patrol command really helps automate factory build time, even though it's obviously more energy dependent than simply assigning a single fabber to build a factory. The nice thing about the area patrol command is that they don't just assist either- they'll go fix things moving and flying in the vicinity as well which can help keep a base in one piece without assistance!