Finally tackled this two weekends ago. Not too bad, used pressure treated plywood and wrapped with darco. Not entirely sure how all of the water got in, but for starters the rear most roller broke the top screws off and the darco had a hole scraped in it. Even though it doesn't explain how the upper layer got wet unless its the condensation from being wrapped in the darco in the first place. Total cost about 50 bucks. Hardest parts was factory used 3/8 luan and I had to bevel the outer edge of the 1/2 inch plywood I used to allow the aluminum face extrusion trim to go back on and match up. About 10 hours start to finish.
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