Perspective cutaway 3D model and photoshop
Cost around 350

A cutaway through part of an object is used to reveal some internal elements that would otherwise remain hidden. Care must be take not to lose the integrity of the whole image if too much is cutaway, although some can be redefined with a thin white outer holding line. The disadvantage with this is you could lose a lot of the outer body missing some other key features and possible company logos. You also need to have the relevant reference for the cross-section through the material you are cutting which can be quite tricky to come across. Most illustrators would construct the whole of the outside shell as well to aid in the accurate cross-sectioning of the outer body.