All three hulls are clad with marine 5086-alloy aluminium, and the entire frame is made of 6061 aluminium. This gives exceptionally long life and ease of maintenance. The structural members were scientifically chosen and placed for greatest strength. With anti-fouling annually, and a repainting every several years, this yacht will last for many decades.
  The upper decks and the aft deck are covered with diamond tread pattern aluminium plate welded at all joining edges. This seals the aluminum skin and frame, which is all welded into one sturdy watertight shell from keel to topmost deck, and stem to stern.
  The cabin is built of 2.5" thick structural insulated panels, supported by sturdy 3" aluminium vertical support beams every 48", and all sealed within a welded 5052 aluminium waterproof casing.
  All windows are double-glazed with UV-stabilized 1/4" clear acrylic.
  All these materials should last for decades without maintenance or concern for weathering or other decomposition.

  The horizontal aluminium frame is an especially rigid construction of heavy super-plasticized-concrete-filled tubes welded together in a grid, reinforced vertically by seven sturdy semi-elliptical braces. A dense framework of epoxy-coated wooden scantlings fills the gaps, all firmly bolted and glued together, bolted to the aluminium frame, all overlapped with epoxy-coated plywood sheets glued down and fastened with hundreds of screws, and then overlaid with glued-down cabin flooring, making it all extremely solid, watertight, and impervious to rot.

  The water-tight bulkheads (located every 96" down the each of the three hulls) are reinforced aluminium plates that are welded full-width to the cross-beam elements. Every bulkhead's 4x4" H-beam reinforcements are welded to the bulkhead plate and the keel, then epoxy-coated all over, making 26 watertight compartments. Even a forceful perpendicular collision or any other major accident will not make this yacht sink.
  With seven substantial vertical elliptical braces welded to the solid horizontal floor frame and the upper-deck frame, all welded to the one-piece aluminium skin, this trimaran is extremely resistant to flexing in heavy seas. The trimaran configuration's very high righting moment and low center of gravity makes capsizing nearly impossible.

  Over-engineered for a canal-boat, certainly. But six tons of welded metal framing and skin makes our yacht an extremely sturdy vessel on the open sea in rougher conditions.