I did it five years ago when I first started with my 55.1 3600. I used a standard marine plywood from home depot (48"x96") cut it into four pieces (two at 6 3/4 " and two at 16 3/4") I only had enough rotten metal strips to make three complete strips. no grooves and no sealer because it was supposed to be temporary. five years later and outside in New York weather every night and day and used for light cargo with leaves and bird droppings and never washed I can honestly say I'm impressed with how well it held up
