love the vintage photo of the greatest frame under the greatest car! is that a dana diff? I too have the sunny car, and thought the same thing about it being AMT based the IMC/TESTORS cougar II also has a n AMT frame of sorts lookin 4ward to your build!
I have used this machine, Friday as a matter of fact! it works nice. as Comp1839 said... aluminum MUST be hospital-clean! when you think it is clean, clean it some more! I have struck an arc on aluminum and it looked I had done it all my life, the next time I could not get anything right! it is a fickle beast!