Copper Supply lines around an inside corner

[lodgera]

I've search the internet and these forums for what I think is a simple answer to no avail. How do you guys deal with routing copper supply lines around inside corners like the attached? The real question is how do you solder the 90 that is back in the stud cavity where the two walls meet? Do you make big notches in studs to get some access back there, or is there some other trick?

 

[Fitter30]

Take your hard copper heat the 18-24" of tubing red hot to take the annealing out of it to make soft copper drill 1 + " holes in the 2x4 bend tubing around if tubing flattens out just resize with adjustable wrenches. Then two couplings.

 

[Sponsor]

 

[lodgera]

That would still require some sort of notch like I attached right? Just wondering if cutting the studs like this is typical.