3D CAD design needed to create a mold for vacuum formed ABS plastic product.

I need 3D CAD drawings to make a vacuum formed mold of ABS plastic. For a heavy duty plastic gardening tray approximately 3'x1'x4. I have sketches, and an existing product from which to copy the basic idea. Changes to size, shape, material, color, and function. It has a basic function and it needs to work as planned. I realize it's a simple design overall, but I want the final design to be sleek--visually and texturally appealing. Knowledge of heavy duty ABS plastic helpful. We are easy to work with and it'll be a fun project.