+1. and I was thinking, you said that you were looking for a top, I would suggest talking to someone who does canvas work for boats. I know on one of my boats, there is a channel that you slide a round flexible dowel into, the dowel is attached to the canvas and it provides a water tight barrier. You could most likely get a top made in 4 sections, Top, Sides, and Back. They could zip together at the meeting edges with a large flap on the outside of the Top section and a flap on the inside from the meeting sections. I made a new cover for my boat and slid thin strips of plastic into the flaps and made them very stiff, but keeps the water out really well.