We found a series of photos showing the actual process that Circa uses for shaping hull plate. Their approach is relatively sophisticated and allows us to chose hull shape and plating thickness that are optimized without worrying if the design can actually be fabricated.

Knowing how much pressure to use and where to apply it is an art form.

Consider that the plate above has a different shape at each end.

A section of plate ready for the turn of the bilge.

FPB 64 hull #4.