Nice! I would recomend selecting the top verts of the outer section , and then also select the verts from the inner outline,up to where it starts curving up. then use the F hotkey. for the curve, use extrude, but also use the snap to feature, which is the magnet icon. from there extrude the back edges, select the sides, fill, then fill the top. then separate by what faces should be defined edges and use hotkey P.
if that makes sense.
Hope my blender expertise is coming in handy. If i get to be too much, let me know :angel