Framing a round wall?
The simplest way to achieve a curve on a wall (not a support wall) is to lay out the curve on thick plywood and cut it out two identical curves as wide as the studs to be used as top and bottom plates. Mark the stud centers on the top and bottom then locate positions and put in place. (plywood does not meet code for support walls but for a decorative wall it should be ok in most areas.) I have seen it done in this matter in an office remodel that pasted local inspections. If applying for a permit and local codes have issue you should be able to cut 4 curves from 7/8 and glue and nail the pairs together to make suitable top and sill plates.