That's pretty freaking cool!!! Got exactly what I wanted with the following prompt:

  Create a 200x100mm rectangle with depth of 12.7mm, 6mm filleted corners, a 25mm center hole, 6.35mm holes in each corner offset 12.7mm each edge, with 1mm chamfer on top of center hole and 0.5mm chamfers on corner holes.

Now, just give me a picture to parametric model prompt generator...and then we can get into assemblies! ;)