Glowball- Good luck on your endevour - Alumaweld has many boats with 72 inch bottoms under 20 ft? I have 18 ft boats in stock with 72 inch bottoms.... And our boats with 82 inch bottoms start at 21 ft... A 20 ft Alumaweld has the exact same side thickness as a 20 ft NR, Osprey or Ranger. We do MANY very custom boat orders. That is one of the benefits of owning an aluminum boat, fab work is easier done than fiberglass. Whatever boat you get, you need to decide what is best for you! Material used, supports under the floor and solid welds along with a custom trailer not just an aftermarket trailer that happens to fit. Once again good luck on your decision!