can anyone tell me where to find plans or patterns for the canvas skirt that encircled the pop-top of the original O'Day 23. The original has a cabin that is lifted on struts by a single crank, like a sheeled camper pop-top. The mast steps through the cabin top on the cabin sole. There are fasteners on the inside of the cabin bottom and matching fasteners on the outside of the coaming on which the cabin rests.