Hi Scott.
Sorry to hear about your work experience. I too have had the same thing happen to me. Only I was on the other side building and deigning the machine and being told that I would get to build all the frames for a stone router. After I designed and built the first three I was told they were giving up the project only to see my frame on their web site and learning they took my work and found a cheaper shop to build them.
But I do have a question for you. What motors and drives were you able to make work with Mach. A machine that size would need Servos. I am building a small five axis machine and I need to use servos on it. Not sure if Mach can do a machine like this but I am going to give it a try.
Thanks