Here is a quick vector I created of the wrench holder. It is not the cleanest but it got me what I was needing done. I will upload the vector files to the files folder.
I pocketed the pockets leaving +.100 excess and then ran a .500 Dia. key cutter to finish the profile at .375 and .500 so it would have a lip.
I also have a 3D model I created that holds the wrenches and the touch probe plate if you are interested, and I have uploaded the 3d printed stl I created so users can use it for free. It is also available on my etsy