All the MULEs come to the MULE party! New unit limit experimentation craziness after a real game on a standard map. I built about 130 command centers and then, building MULEs as fast as I can, I could very briefly get up to 255, which I think is the limit, but you have to have 510 APM to build 255 in 30 seconds. Here's a screenshot shortly afterwards.
I liked your original post about the system limits. I just don't see anything new here. Sorry. Referring back to your previous post on the subject again... you know a lot about this stuff. I think you can find more interesting things to explore. Please, move on to a different experiment and share your findings.
This was just for fun. I don't really have time to do any meaningful investigation, I'd rather be playing.