5" propeller duct for quadcopter

I did not like the propeller ducts found on the internet, none of them fit my ZMR250 frame. So I decided to design my own. it is the V1.0. It has only slanted walls, no convex upper surface. I will try to make more designs in the future.

The link for the Autodesk Fusion 360 design is http://a360.co/2yGHCph