The 2D drawing leaves a bit to the imagination, but attached is a one way to model something close. I tried several other methods such as modeling the overall body, such as a swept solid and adding cutouts, but they all had problems with missing faces and such when the blend radii were added.
Do we need to complicate this model this much ?
If i look at the image from Bwsh, it's a hollow cylinder , with diagonal grooves.
Modeling this as a "cylinder" instead of sweeps should simplify the task.
( Extruding a circle will create a cylindrical face as well as using the feature "Cylinder".)
- If the end result should be cylindrical, and we do not have a purpose creating a far more complex face such as a helical B-surface, Go cylindrical.