If the hinge line were 2-3" lower so the top part tilts in, or...
If the hinge line is out at the edge of the cap so it's swing is down and out, or...
If the hinge arm was offset like a car door hinge, or...
If there was a trick 4-bar linkage on the inner eave of the cap holding onto the edge of the window....
Are you going to go for brass or black anodized finish, or what?