To make a part, similar to the second picture:
1. sketch the profile in the front view (V-shaped) and then extrude it with Pad 195mm long
2. use Shell command to hollow out the reservoir based on the material thickness (maybe 2.1 ?) , selecting the top face to be open
3. sketch the circular profile (R=95.5) in the front corner, and cut it out with Pocket
4. use Hole to add screw holes
5. add 10mm wide flange on top with Pad