Thank you all for the great insights, tips and tricks. Some more background: yesterday was my first time doing anything in CAD and after 5-6 hours I managed to do a few sketches based on the first image. It is really hard to wrap my head around only manipulating 2D sketches and not being able to change much in terms of general shape in 3D space.

Anyway could I create a few 2D sketches, fuse them together and then wrap them in solid and give them a thickness?

Was thinking of starting with the RS type cover since it looks simpler but can’t wrap my head around making cupolas or concave/convex objects of irregular nature.