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Using the closures is a good idea, if you go back with the corrugated. You will also want to run the screws through the highs and not the lows--helps to prevent water intrusion, since the water will run in the lows.
If going through the highs, don't overtighten the fasteners since you can kink the sheets very easily--esp 29 ga.
Use #14 hex head fasteners with neoprene/metal washers if the profile of your corrugated is 1/2" depth, use a 1" or even better 1-1/2" long fastener. You can stick with self-drillers if you like, but I prefer B or AB point self-tappers. You need to drill the pilot holes, and get them in 410 SS instead of 304 and they won't strip as easily. You can use 3/4" A point in 304 SS on the laps.
For superior protection, use butyl tape caulking on your side and butt laps as well.
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Eric
83 911SC/83 944
bunch of Honda 750s
69 Chevrolet C-20 Longhorn (family heirloom)
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