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I dont know if alpha tig has frequency adjustment, I've never used it. It probably has a fixed frequency of around 120hz, which is decent for aluminum. I use my lincoln Pt275 and it's old school 60hz frequency all the time. The longevity 160sx has a fixed 100hz frequency, it is tigher than the lincoln even though the machine cost 1/5th. I've never used an adjustable frequency machine, but from watching web videos the tigher arc is nice, though not a deal breaker IMHO.
I also do not know about the air cooled torch, you can always buy two and put one in an ice bucket to cool down, or
just buy the water cooled torch and hook up a garden hose to it. Or a little pump used in a fish tank or tile saw recirculating pump at lowes for $30. A lot cheaper than a water cooler.
anways just something to think about, good luck wishing you the best on this project. I think its very coool!!!!!
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