Hotrod, I did a test with silkaflex 252 on some test panels and was able to pull them apart after they cured for several days.( followed the directions to the letter) I have seen several trailers with the sides peeled open so I used shaveable rivets instead.
I have never used the 3M tape. If you use that wall thickness tubing on 16" centers your box will be quite heavy. I used 14ga 2X2 for vertical studs and 2X3 and 2X4 11ga for the floor and roof outer perimeter. Just something to consider.
MMM
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