Well Bowerbord can only work from a Mesh input so you kind of have to work with meshes.
There are RSlit and BoxSlit components under the INTERSECT tab but I can never get these to work.
When you convert your Brep to a Mesh, the mesh settings dictate how well the mesh will approximate your Brep. A high quality mesh with very close approximation to the Brep will result in a mesh that has lots of small mesh faces. This will give slices that are polylines made up of lots of small lines. If the lines are small enough you won’t notice the faceting of curves when you CNC machine them.
I have found Bowerbird to be very good for this type of project but I don’t think you can specify exactly where the section planes will be… Bowerbird determines this.