Create a high detail 3D design of a T-rex dinosaur in grayscale bas relief style. The T-rex should have realistic textures and intricate details, capturing the essence of its scales, teeth, and powerful build. The bas relief should have a strong sense of depth, with the T-rex emerging prominently from the background. Ensure the design highlights the contrast between the different parts of the T-rex to make the grayscale shading effective. The overall appearance should be dramatic and lifelike, suitable for 3D printing or digital rendering.