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I was thinking of 2 ways to make boatails.
Take medium sized tubing, inflate it and then fold it back and forth like intestines a bunch of times, glueing the folded tubes together to form a boatail shape.
Make a boatail out of fabric then sew a huge number of threads between the top and bottom and the left and right sides to pull it to the correct shape. Im curious, how did they sew all the threads in the inflatoplane, long needles?? With something as big as a boatail it might be best to sew from inside. I was thinking bend 4 or 6 steel tubes to form the corners. Attach one end of the tubes to a support, maybe scaffolding, or a pair of bookshelves etc. Take the open vehicle end of the fabric boatail and slide it tightly over the curved corner tubes. crawl in the open end with thread and a needled and sew working backwards. When done disconnect the tubes from the support and pull them out one at a time. If the bottom side of the boatail is flat than this could be done directly on the floor or ground.
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