Design cover for camera

I would like to design a cover for a camera prototype I have. The design will be then refined and used for 3d printing. Several versions may be needed as we develop the camera and change internal component. So if you get the first job, the revisions will probably also go to you. Attached an image. I would like the cover to include a front piece (to cover the core of the camera), a back cover with ventilation and a piece for the detachable probe in the front. The final product will need to be in either STRP of IGES formats. Sketches of the components will be shared later. I look forward to working with you. Thank you