Do some 3D Modelling

I'm designing a new layout for our workshop area and have done a simple line drawing in 2D. I'd like to have this rendered in 3D with a walk through. I also have a bunch of photographs to help. You will have to make some assumptions as to the style of some of the elements in the workshop, but I can guide you on this. This is only going to be used to show the department manager how the new workshop layout may look. Scaling also isn't overly critical but we do want it to look cool and hi res with a mannequin in shoot so we can see a degree of scale.