Art,
This was a design I made out of a tarp I purchased from WM. It worked  really 
well except the 1" PVC acquired a bend from constant use. I would insert  
wood doweling if I were to do it again for stiffness. The whole thing rolled up  
nicely and fit in the V berth when not used. About the only time I used it was 
 when we had a group on board and it rained. The sides kept the cockpit dry 
and  made for a great party area.
 
R