I don't see why not it wouldn't work, assuming you got the process right and produced them in a clean enough environment. Yields would probably be lower than th

I don't see why not it wouldn't work, assuming you got the process right and produced them in a clean enough environment. Yields would probably be lower than that of a professional foundary during the 60s or 70s that was processing at the same feature size. Performance of your DIY 6502 would probably be lower as well -- requiring more power and producing more waste heat to run at a lower clock rate than that of an original. So would it work? Possibly. Work as well? Less likely. All IMO, of course.