Base plate for mounting on Kreg brand "circular saw straight edge"

I wanted to build a "base plate" that I could import into other designs to mount models in a straight, aligned configuration. (For me, I am building lens mounts for optics experiments with kids).

This model slots into the center "race" of the Kreg brand "Straight Edge Guide", so when you sketch or mesh-mix your models aligned to the top plane, you have a straight, true, slideable mounting platform for your bits and pieces.

Using this model:

This is intended to be used as a part of the design of other model parts.

In Fusion360, you can import the STL (import mesh), then create a sketch from a cross section of the imported mesh.