Each DIY Packraft size is a different design, and because the side tubes are not parallel (the front of the boat is narrower than the back), you cannot lengthen or shorten the cockpit without completely changing the geometry of the boat – you would have to change the angle between the sides as well as their length, and this would also change the shape of the tubes:
Because the packraft tubes are curved in 3D space, changing the length is not a matter of adjusting the angles of a few straight lines or even simple curves – it’s a complex 3D geometry problem, best solved by a computer.
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