Hard to say from the pics Scott but if you're having leak trouble it might be because your joints look "off".
Clean the tube first with a little steel wool and try a bit more heat. Some of those joints look cold.
My manual mill is up to snuff, but my cnc lathe project isn't yet done.
Even then though, it's just nearly impossible to compete on timing and price.
Also the material price doesn't work out. Chances are most of the copper wasn't the...
The classic spiral evap is decent, not the best though.
I think years of empiric data supports Steppers and even Container evaps before spirals, but the spirals are very easy to work with, easy to get machined, and work out decently...