Free pontoon boat plans. well look what we have cooking here: free plans to make your own pontoon boat! length: 12′ (3.7 m). Boat plans: boat plans from 36 designers and counting. sail, row, power, paddle—we are sure you will find the perfect boat.. Composite cruiser – the primary purpose of this design was to build a small pram style boat that was ultra-lightweight, easy and inexpensive to build, was unsinkable.