I understand on how other edges of these views correlate with each other. I just do not get on what to do with this surface (highlighted with red).
I see 4-solutions. I added straight lines (in GIMP) to represent canted faces. Either the original posted by NMech along with either or both surfaces as canted are also viable alternatives.
(As NMech noted, they could have curvature (except you might then have to show the center of the arc, unless they were b-splines(?).)