Hello RC, we have 4 of the 181i's, slightly smaller than the one that you linked on here. They are great machines, in my opinion, but as you said they don't do AC for aluminum purposes. If you want a smaller machine with that capability the Miller Dynasty 200 is really the machine or one of the Thermal Arc inverters in the same class, I believe these are the Arcmaster 186's. They are pricey though. Good luck and best regards, Allan