Copper tubes ...

[voigts]

Looks nice!

I've long wondered why nobody has bothered to make a large radius elbow fitting. Everybody keeps complaining about the pressure drop of elbows, and the solution (or at least a partial amelioration of the problem) is as simple as not making it a "hard" corner. It can't be that hard to make such an item...

Way to be resourceful and fill the market gap with a bit of good ol' DIY elbow grease. Now just polish it up nice and shiny! j/k

I buy the copper long sweep elbows from Mcmaster - #5520K603. They have a considerably larger radius than regular elbows. The other thing I did when hard lining mine is to use flexible copper and bend it using a pipe bender. This way you don't have to have all straight lines. With some work I am able to get a 180 turn with about a 4" diameter. ACE hardware sells flexible (some call it soft) copper by the foot for about $2.60 instead of in some 50' roll like Lowes.

Instead of polishing my hard lines, I painted them black. And yes, these lines are all copper.