A lot of time for someone to fanny about with them. To reproduce those images shouldn't take long at all. It's 4 basic extrusions (rectangles) and a circular extrusion. Apply appearances to each of them, and bobs your uncle done.
Stick it in a drw template, auto balloon, BOM table, 3D view. Simples.
Then again, you can either pay someone who will get it factually correct, or someone arty farty who will spend hours making it look "pretty". MY advice is find someone with a copy of solidworks of similar and get them to knock up a few rendered images. Cheap, functional, done.