Yacht window cover help

[scott_san_diego]

Went and looked at a new yacht for a broker.  One of the things the customer who is buying the boat wants is Sunbrella window cover. To be in two pieces.  In the pictures below you can see the two steps going up to the bridge.  There is a space between the back of the step and the window.  What I am having trouble figuring out is the best way to mount the sunbrella to the boat.  The cover will end at each far corner.  It will not cover the two side windows.
So far I have figured out is behind the steps is to use 2" velcro to hold the two halves together.   The real problem I can not figure out is how to hold the top of the cover in place.  The space between the top of the window and the underside of the bride floor is real tight.  

Any suggestions would be appreciated.

[Darren Henry]

How about awning track/keder welt mounted to the bottom of the visor?

[Mike]

when I do a cover like this there are no snaps above the window in front  as you see you cant install any. only snaps on the side at the top and at the bottom.
this was my last

https://scontent-mia1-1.xx.fbcdn.net/v/t1.0-9/487533_1018635838209489_7243156869396002341_n.jpg?oh=afb19c7aad4ad3c7bc2a8cf8cc5d7bc9&oe=580E715C
of course yours with the step to work around and the owner wanting 2 piece? why id go a zipper not Velcro to hold