Rectangular to Circular Adapter Creator (Parametric)

I started this project because I needed the dust collector adapter model included in this post. If you're interested in that model only, you can go here for greater detail. However, as I designed the adapter in Fusion 360, I realized I could generate a fully parametric model that would let others customize their own rectangular to circular adapters for dust collection, HVAC, vent lines, etc. The Parametric Model: I have included both the Fusion 360 .f3d file and general .step file to use in what