Sk3 63mm Motor fan cover

Here is a work in progress. The goal was to create a cover for the huge holes on the back of the 63mm sk3 motors (6354, 6364, or 6374). But why have a cover when you could make a fan to help cool the motors? I have yet to test the fluid dynamics of how the fan helps, but it seems to help on my first tests. Im using these in a dual surf rods setup, so im really tight on space. The cover doesn't stick out past the cans button, so with the right 3mm screws nothing will stick out past the and of the