I have one on mine but to be honest they are not very good. They are not dry inside with holes on top and drain holes below. I would lay one up yourself over a marine ply box and fit proper weathertight hatches. I’ve adapted mine now with proper hatch lids. I’ll try to upload a photo.
Thanks for your reply. They look fantastic! I’ll measure the area and let you know later today. Do you have a website or email address I can contact you directly on? Kindest regards Esmé