CAD and 3D renderings of pool project

Hi, I need you to design and make CAD drawings and 3D renderings of my project to turn a parking garage to a pool area. Please see attachment. We would change current structure to a horse shoe form, building regulations prescribe that part of surface must be open so that water can drain through. The rest of the area, we would make a roof garden on top of reconfigured garages, and put a pool at the back end of area. We would have an elevator from garage level to garden level. There would be a a house/shed.