Here is three stl files saved, Two Different programs and different formats
a screen capture.
and the toolpath using a 3/8 inch ball endmill
I did not have the outside features to outline the seat base.
20" square blank so you can hold it down and cut the shape.
Using Art's machcloud program, I opened your cloud points file, created a triangle mesh using the delaunary set then saved it as a stl (make sure you add the stl extension)
I then used ArtCam to import the stl file and created the toolpath. Not sure how BOBCrap does it (I used it at one time, so I have a history with them, there on my blocked phone list now)
Used ArtCam to create a couple of stl files in different formats (Binary & Ascii) in case Bob cant read machclouds file. Let me know if you need an ".obj" file instead.