As an alternative to Fusion 360, and in the same price range - free, I've been using DesignSpark 3D for quite a while now. It's not as powerful as 360, and for that reason I've been threatening to devote the time to learning 360.
DesignSpark is a decent package, it's a stripped down version of Space Claim I believe. You can do a lot with it, if you can build your shape out of a composite of triangles, circles and rectangles. I even managed to draw and 3D print Imperial 1/2-13 threads, with a CAD package that likes to think in mm. The parts for my Colt 1908 rubber band guns were designed using DesignSpark.
Don