Yes, Michael, thanks for that, but the surface needs to be exact, and the fillet won't do. See the model:
https://altuit.cloud/web/dbpub/3D/NextBook03.3dm

And FWIW, the sweep did not go around a cornered rail, but rather a radiused one. (See dot 1)

The corners are perfect little radiuses. The profile must be exact as this solid will be subtracted from a design to form a cavity, which will then be NC milled to create a perfect fit for THIS android tablet model.

Perhaps I need to separate it in quarters?