bravo!!!!
you're over the PP hump and are fast on your way to being a pro!
cutting the shapes for the square in square is easy just cut it 0.5 inches larger then what you need and trim it down - that gives you plenty of room on each side.
the boat thing is a different story because all the shapes are different sizes and all the angles are different too.
in this case i would do strip paper piecing.
you figure out the size strip you need to cover the large sections and go to work. it might be something like 5 inches high by the width of the fabric.
sew the strip on to the paper, fold it over to cover the section, and trim the 1/4 seam for the next section.
then when you need that color again just use the strip.