Build curved wall:
Cut 1/4″ drywall to size, score on the side that will be the exterior of the curve, and get it very WET:
Fasten to studs as usual, taking extra care at curved/scored areas:
Drywall both sides of wall:
Chill on front of your new wall:
Seem too easy? That’s because we have to do it all again to get the minimum 1/2″ thickness. Then spackke and get it super smooth. But stll, fairly easier than I imagined it would be- and now we have a “half bath” with 4 walls!
madison square home 
Looking at the picture I think it can be done with half inch and it saves a lot of time and mud not much sanding less seams.
Yes, the sanding took forever! But unfortunately this radius was just too tight to use 1/2″.