I used 3 mm Ali floor I used sikaflex 3/16 or 4.8mm rivets at 50mm pitch which where sealed and steel rivets for strength remember if you do you steel rivets on Ali you will need to put a blob of sealer or paint or something as the steel and Ali will react together. I did use countersunk rivets where the side panels fit and I am glad I did as the side panels where tight
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