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Unless you have your heart set on SS I would try this stuff...
I used the newer NICOPP brake lines.(nickel+Copper+Iron) on one of my projects. Really easy to bend and they will not rust. CNC 325 is 3/16" and CNC 425 is 1/4". I bought mine from this guy:
http://www.ebay.com/itm/CNC-325-3-16...f2369a&vxp=mtr
http://www.ebay.com/itm/CNC425-1-4-C...624aa8&vxp=mtr
Best price I could find at the time. You can actually coil it around a 1" wooden dowel by hand without kinking it. It also flares easy with a regular double flaring tool and there are coated flare nuts available. Some of the auto parts stores carry it but it is quite a bit more $.
LockDoc