You can model a part for your Autodesk Inventor Assembly, but that's the easy bit! Find out the about the essential Assembly Techniques that will prevent you tearing your Hair out!.
By default Autodesk Inventor will dimension the Radius of an Arc in a sketch. So how do you find the Length of the Arc? And what if you want to specify the Arc Length to drive your sketch?
This is a variation on a Stopped chamfer Inventor iFeature. This version of a stopped chamfer has double curved ends, you might form these with a router, spindle moulder or spoke shave.