This is the technique for assembling the Stasha in the water. Launch both sections.

Climb into the more buoyant front, pull the rear towards you and slot in the two lower bolts, shift your weight forward a little to keep the section in place and then just add the two top bolts and do up with the wingnuts.

This film is at double speed so it takes about 30 seconds in real time to join the two halves.