If I were you I would buy prebent mandrel bends and weld them together., It looks tricker that way with nickel/nickel/nickel tig welds and you can mock it up easier. You will never bend that big of tube as tight as you need it for IC plumbing without spending $$$. Not anyway that I know of anyway. If you really want to, call a metal fabrication job shop and see if they'll bend up that tube on a real mandrel bender to your specs. That way at least you can say it is your design.
my signature lines...not really directed at anyone in particular..
BE different....ACT normal.
No one is completely useless..They can always be used as a bad example