Im a licenced Architect from Mexico, I have done designing, drafting and construction work in the several firms where I have worked, all this on residential, commercial and industrial buildings. My workflow includes CAD, 3D Max+ Vray and photothosp to try and and achieve the most photorealistic renderings, for my work you can check my freelancer portfolio with my latest jobs in these areas.
I would like to know what the project is about, so far you just mentioned a 3D Cad design, I'm guessing you will need a detailed bathroom scene to render your product, in what program do you need it to be?, or will you photoshop the product into the rendered image?, perhaps modeling it as well could help.
Best regards.
Jose Luis Treviño, Architect